mirror of
https://git.postgresql.org/git/postgresql.git
synced 2026-02-20 13:27:00 +08:00
f45df8c014
blanks, in hopes of reducing the surprise factor for newbies. Remove redundant operators for VARCHAR (it depends wholly on TEXT operations now). Clean up resolution of ambiguous operators/functions to avoid surprising choices for domains: domains are treated as equivalent to their base types and binary-coercibility is no longer considered a preference item when choosing among multiple operators/functions. IsBinaryCoercible now correctly reflects the notion that you need *only* relabel the type to get from type A to type B: that is, a domain is binary-coercible to its base type, but not vice versa. Various marginal cleanup, including merging the essentially duplicate resolution code in parse_func.c and parse_oper.c. Improve opr_sanity regression test to understand about binary compatibility (using pg_cast), and fix a couple of small errors in the catalogs revealed thereby. Restructure "special operator" handling to fetch operators via index opclasses rather than hardwiring assumptions about names (cleans up the pattern_ops stuff a little).
334 lines
10 KiB
SQL
334 lines
10 KiB
SQL
--
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-- STRINGS
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-- Test various data entry syntaxes.
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--
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-- SQL92 string continuation syntax
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-- E021-03 character string literals
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SELECT 'first line'
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' - next line'
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' - third line'
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AS "Three lines to one";
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-- illegal string continuation syntax
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SELECT 'first line'
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' - next line' /* this comment is not allowed here */
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' - third line'
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AS "Illegal comment within continuation";
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--
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-- test conversions between various string types
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-- E021-10 implicit casting among the character data types
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--
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SELECT CAST(f1 AS text) AS "text(char)" FROM CHAR_TBL;
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SELECT CAST(f1 AS text) AS "text(varchar)" FROM VARCHAR_TBL;
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SELECT CAST(name 'namefield' AS text) AS "text(name)";
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-- since this is an explicit cast, it should truncate w/o error:
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SELECT CAST(f1 AS char(10)) AS "char(text)" FROM TEXT_TBL;
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-- note: implicit-cast case is tested in char.sql
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SELECT CAST(f1 AS char(20)) AS "char(text)" FROM TEXT_TBL;
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SELECT CAST(f1 AS char(10)) AS "char(varchar)" FROM VARCHAR_TBL;
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SELECT CAST(name 'namefield' AS char(10)) AS "char(name)";
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SELECT CAST(f1 AS varchar) AS "varchar(text)" FROM TEXT_TBL;
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SELECT CAST(f1 AS varchar) AS "varchar(char)" FROM CHAR_TBL;
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SELECT CAST(name 'namefield' AS varchar) AS "varchar(name)";
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--
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-- test SQL92 string functions
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-- E### and T### are feature reference numbers from SQL99
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--
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-- E021-09 trim function
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SELECT TRIM(BOTH FROM ' bunch o blanks ') = 'bunch o blanks' AS "bunch o blanks";
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SELECT TRIM(LEADING FROM ' bunch o blanks ') = 'bunch o blanks ' AS "bunch o blanks ";
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SELECT TRIM(TRAILING FROM ' bunch o blanks ') = ' bunch o blanks' AS " bunch o blanks";
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SELECT TRIM(BOTH 'x' FROM 'xxxxxsome Xsxxxxx') = 'some Xs' AS "some Xs";
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-- E021-06 substring expression
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SELECT SUBSTRING('1234567890' FROM 3) = '34567890' AS "34567890";
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SELECT SUBSTRING('1234567890' FROM 4 FOR 3) = '456' AS "456";
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-- T581 regular expression substring (with SQL99's bizarre regexp syntax)
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SELECT SUBSTRING('abcdefg' FROM 'a#"(b_d)#"%' FOR '#') AS "bcd";
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-- No match should return NULL
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SELECT SUBSTRING('abcdefg' FROM '#"(b_d)#"%' FOR '#') IS NULL AS "True";
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-- Null inputs should return NULL
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SELECT SUBSTRING('abcdefg' FROM '(b|c)' FOR NULL) IS NULL AS "True";
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SELECT SUBSTRING(NULL FROM '(b|c)' FOR '#') IS NULL AS "True";
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SELECT SUBSTRING('abcdefg' FROM NULL FOR '#') IS NULL AS "True";
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-- PostgreSQL extension to allow omitting the escape character;
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-- here the regexp is taken as Posix syntax
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SELECT SUBSTRING('abcdefg' FROM 'c.e') AS "cde";
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-- With a parenthesized subexpression, return only what matches the subexpr
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SELECT SUBSTRING('abcdefg' FROM 'b(.*)f') AS "cde";
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-- E021-11 position expression
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SELECT POSITION('4' IN '1234567890') = '4' AS "4";
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SELECT POSITION(5 IN '1234567890') = '5' AS "5";
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-- T312 character overlay function
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SELECT OVERLAY('abcdef' PLACING '45' FROM 4) AS "abc45f";
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SELECT OVERLAY('yabadoo' PLACING 'daba' FROM 5) AS "yabadaba";
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SELECT OVERLAY('yabadoo' PLACING 'daba' FROM 5 FOR 0) AS "yabadabadoo";
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SELECT OVERLAY('babosa' PLACING 'ubb' FROM 2 FOR 4) AS "bubba";
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--
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-- test LIKE
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-- Be sure to form every test as a LIKE/NOT LIKE pair.
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--
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-- simplest examples
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-- E061-04 like predicate
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SELECT 'hawkeye' LIKE 'h%' AS "true";
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SELECT 'hawkeye' NOT LIKE 'h%' AS "false";
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SELECT 'hawkeye' LIKE 'H%' AS "false";
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SELECT 'hawkeye' NOT LIKE 'H%' AS "true";
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SELECT 'hawkeye' LIKE 'indio%' AS "false";
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SELECT 'hawkeye' NOT LIKE 'indio%' AS "true";
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SELECT 'hawkeye' LIKE 'h%eye' AS "true";
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SELECT 'hawkeye' NOT LIKE 'h%eye' AS "false";
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SELECT 'indio' LIKE '_ndio' AS "true";
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SELECT 'indio' NOT LIKE '_ndio' AS "false";
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SELECT 'indio' LIKE 'in__o' AS "true";
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SELECT 'indio' NOT LIKE 'in__o' AS "false";
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SELECT 'indio' LIKE 'in_o' AS "false";
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SELECT 'indio' NOT LIKE 'in_o' AS "true";
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-- unused escape character
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SELECT 'hawkeye' LIKE 'h%' ESCAPE '#' AS "true";
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SELECT 'hawkeye' NOT LIKE 'h%' ESCAPE '#' AS "false";
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SELECT 'indio' LIKE 'ind_o' ESCAPE '$' AS "true";
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SELECT 'indio' NOT LIKE 'ind_o' ESCAPE '$' AS "false";
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-- escape character
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-- E061-05 like predicate with escape clause
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SELECT 'h%' LIKE 'h#%' ESCAPE '#' AS "true";
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SELECT 'h%' NOT LIKE 'h#%' ESCAPE '#' AS "false";
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SELECT 'h%wkeye' LIKE 'h#%' ESCAPE '#' AS "false";
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SELECT 'h%wkeye' NOT LIKE 'h#%' ESCAPE '#' AS "true";
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SELECT 'h%wkeye' LIKE 'h#%%' ESCAPE '#' AS "true";
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SELECT 'h%wkeye' NOT LIKE 'h#%%' ESCAPE '#' AS "false";
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SELECT 'h%awkeye' LIKE 'h#%a%k%e' ESCAPE '#' AS "true";
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SELECT 'h%awkeye' NOT LIKE 'h#%a%k%e' ESCAPE '#' AS "false";
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SELECT 'indio' LIKE '_ndio' ESCAPE '$' AS "true";
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SELECT 'indio' NOT LIKE '_ndio' ESCAPE '$' AS "false";
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SELECT 'i_dio' LIKE 'i$_d_o' ESCAPE '$' AS "true";
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SELECT 'i_dio' NOT LIKE 'i$_d_o' ESCAPE '$' AS "false";
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SELECT 'i_dio' LIKE 'i$_nd_o' ESCAPE '$' AS "false";
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SELECT 'i_dio' NOT LIKE 'i$_nd_o' ESCAPE '$' AS "true";
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SELECT 'i_dio' LIKE 'i$_d%o' ESCAPE '$' AS "true";
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SELECT 'i_dio' NOT LIKE 'i$_d%o' ESCAPE '$' AS "false";
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-- escape character same as pattern character
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SELECT 'maca' LIKE 'm%aca' ESCAPE '%' AS "true";
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SELECT 'maca' NOT LIKE 'm%aca' ESCAPE '%' AS "false";
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SELECT 'ma%a' LIKE 'm%a%%a' ESCAPE '%' AS "true";
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SELECT 'ma%a' NOT LIKE 'm%a%%a' ESCAPE '%' AS "false";
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SELECT 'bear' LIKE 'b_ear' ESCAPE '_' AS "true";
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SELECT 'bear' NOT LIKE 'b_ear' ESCAPE '_' AS "false";
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SELECT 'be_r' LIKE 'b_e__r' ESCAPE '_' AS "true";
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SELECT 'be_r' NOT LIKE 'b_e__r' ESCAPE '_' AS "false";
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SELECT 'be_r' LIKE '__e__r' ESCAPE '_' AS "false";
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SELECT 'be_r' NOT LIKE '__e__r' ESCAPE '_' AS "true";
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--
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-- test ILIKE (case-insensitive LIKE)
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-- Be sure to form every test as an ILIKE/NOT ILIKE pair.
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--
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SELECT 'hawkeye' ILIKE 'h%' AS "true";
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SELECT 'hawkeye' NOT ILIKE 'h%' AS "false";
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SELECT 'hawkeye' ILIKE 'H%' AS "true";
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SELECT 'hawkeye' NOT ILIKE 'H%' AS "false";
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SELECT 'hawkeye' ILIKE 'H%Eye' AS "true";
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SELECT 'hawkeye' NOT ILIKE 'H%Eye' AS "false";
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SELECT 'Hawkeye' ILIKE 'h%' AS "true";
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SELECT 'Hawkeye' NOT ILIKE 'h%' AS "false";
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--
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-- test implicit type conversion
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--
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-- E021-07 character concatenation
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SELECT 'unknown' || ' and unknown' AS "Concat unknown types";
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SELECT text 'text' || ' and unknown' AS "Concat text to unknown type";
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SELECT char(20) 'characters' || ' and text' AS "Concat char to unknown type";
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SELECT text 'text' || char(20) ' and characters' AS "Concat text to char";
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SELECT text 'text' || varchar ' and varchar' AS "Concat text to varchar";
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--
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-- test substr with toasted text values
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--
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CREATE TABLE toasttest(f1 text);
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insert into toasttest values(repeat('1234567890',10000));
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insert into toasttest values(repeat('1234567890',10000));
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--
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-- Ensure that some values are uncompressed, to test the faster substring
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-- operation used in that case
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--
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alter table toasttest alter column f1 set storage external;
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insert into toasttest values(repeat('1234567890',10000));
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insert into toasttest values(repeat('1234567890',10000));
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-- If the starting position is zero or less, then return from the start of the string
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-- adjusting the length to be consistent with the "negative start" per SQL92.
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SELECT substr(f1, -1, 5) from toasttest;
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-- If the length is less than zero, an ERROR is thrown.
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SELECT substr(f1, 5, -1) from toasttest;
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-- If no third argument (length) is provided, the length to the end of the
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-- string is assumed.
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SELECT substr(f1, 99995) from toasttest;
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-- If start plus length is > string length, the result is truncated to
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-- string length
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SELECT substr(f1, 99995, 10) from toasttest;
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DROP TABLE toasttest;
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--
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-- test substr with toasted bytea values
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--
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CREATE TABLE toasttest(f1 bytea);
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insert into toasttest values(decode(repeat('1234567890',10000),'escape'));
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insert into toasttest values(decode(repeat('1234567890',10000),'escape'));
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--
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-- Ensure that some values are uncompressed, to test the faster substring
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-- operation used in that case
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--
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alter table toasttest alter column f1 set storage external;
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insert into toasttest values(decode(repeat('1234567890',10000),'escape'));
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insert into toasttest values(decode(repeat('1234567890',10000),'escape'));
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-- If the starting position is zero or less, then return from the start of the string
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-- adjusting the length to be consistent with the "negative start" per SQL92.
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SELECT substr(f1, -1, 5) from toasttest;
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-- If the length is less than zero, an ERROR is thrown.
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SELECT substr(f1, 5, -1) from toasttest;
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-- If no third argument (length) is provided, the length to the end of the
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-- string is assumed.
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SELECT substr(f1, 99995) from toasttest;
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-- If start plus length is > string length, the result is truncated to
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-- string length
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SELECT substr(f1, 99995, 10) from toasttest;
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DROP TABLE toasttest;
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--
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-- test length
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--
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SELECT length('abcdef') AS "length_6";
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--
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-- test strpos
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--
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SELECT strpos('abcdef', 'cd') AS "pos_3";
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SELECT strpos('abcdef', 'xy') AS "pos_0";
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--
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-- test replace
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--
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SELECT replace('abcdef', 'de', '45') AS "abc45f";
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SELECT replace('yabadabadoo', 'ba', '123') AS "ya123da123doo";
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SELECT replace('yabadoo', 'bad', '') AS "yaoo";
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--
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-- test split_part
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--
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select split_part('joeuser@mydatabase','@',0) AS "an error";
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select split_part('joeuser@mydatabase','@',1) AS "joeuser";
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select split_part('joeuser@mydatabase','@',2) AS "mydatabase";
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select split_part('joeuser@mydatabase','@',3) AS "empty string";
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select split_part('@joeuser@mydatabase@','@',2) AS "joeuser";
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--
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-- test to_hex
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--
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select to_hex(256*256*256 - 1) AS "ffffff";
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select to_hex(256::bigint*256::bigint*256::bigint*256::bigint - 1) AS "ffffffff";
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--
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-- MD5 test suite - from IETF RFC 1321
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-- (see: ftp://ftp.rfc-editor.org/in-notes/rfc1321.txt)
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--
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select md5('') = 'd41d8cd98f00b204e9800998ecf8427e' AS "TRUE";
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select md5('a') = '0cc175b9c0f1b6a831c399e269772661' AS "TRUE";
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select md5('abc') = '900150983cd24fb0d6963f7d28e17f72' AS "TRUE";
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select md5('message digest') = 'f96b697d7cb7938d525a2f31aaf161d0' AS "TRUE";
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select md5('abcdefghijklmnopqrstuvwxyz') = 'c3fcd3d76192e4007dfb496cca67e13b' AS "TRUE";
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select md5('ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789') = 'd174ab98d277d9f5a5611c2c9f419d9f' AS "TRUE";
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select md5('12345678901234567890123456789012345678901234567890123456789012345678901234567890') = '57edf4a22be3c955ac49da2e2107b67a' AS "TRUE";
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