68 lines
1.1 KiB
Plaintext
68 lines
1.1 KiB
Plaintext
drop table if exists t1,t2;
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CREATE TABLE t1 (pk int primary key, a VARCHAR(400));
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INSERT INTO t1 VALUES (1,'A'), (2,'a'), (3,'a '), (4,'a '),
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(5,'B'), (6,'b'), (7,'b '), (8,'b ');
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SELECT COUNT(DISTINCT a) FROM t1;
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COUNT(DISTINCT a)
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2
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DROP TABLE t1;
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CREATE TABLE t1 (pk int primary key, a int, b int, c int);
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INSERT INTO t1 (pk, a, b, c) VALUES
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(1,1,1,1), (2,1,1,2), (3,1,1,3),
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(4,1,2,1), (5,1,2,2), (6,1,2,3),
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(7,1,3,1), (8,1,3,2), (9,1,3,3),
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(10,2,1,1), (11,2,1,2), (12,2,1,3),
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(13,2,2,1), (14,2,2,2), (15,2,2,3),
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(16,2,3,1), (17,2,3,2), (18,2,3,3),
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(19,3,1,1), (20,3,1,2), (21,3,1,3),
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(22,3,2,1), (23,3,2,2), (24,3,2,3),
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(25,3,3,1), (26,3,3,2), (27,3,3,3);
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SELECT b/c as v, a FROM t1 ORDER BY v, a;
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v a
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0.3333 1
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0.3333 2
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0.3333 3
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0.5000 1
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0.5000 2
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0.5000 3
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0.6667 1
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0.6667 2
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0.6667 3
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1.0000 1
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1.0000 1
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1.0000 1
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1.0000 2
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1.0000 2
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1.0000 2
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1.0000 3
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1.0000 3
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1.0000 3
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1.5000 1
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1.5000 2
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1.5000 3
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2.0000 1
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2.0000 2
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2.0000 3
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3.0000 1
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3.0000 2
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3.0000 3
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SELECT b/c as v, SUM(a) FROM t1 GROUP BY v ORDER BY v;
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v SUM(a)
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0.3333 6
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0.5000 6
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0.6667 6
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1.0000 18
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1.5000 6
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2.0000 6
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3.0000 6
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SELECT SUM(a) as suma FROM t1 GROUP BY b/c ORDER BY suma;
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suma
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6
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6
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6
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6
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6
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6
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18
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DROP TABLE t1;
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