7a0c7f45b2
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710 B
710 B
COUNT
Description '35;'35;' 35; Syntax
COUNT([DISTINCT] expr)
Number of rows used to return the required rows
'35;'35; example
MySQL > select count(*) from log_statis group by datetime;
+----------+
| count(*) |
+----------+
| 28515903 |
+----------+
MySQL > select count(datetime) from log_statis group by datetime;
+-------------------+
count (`datetime') 1244;
+-------------------+
| 28521682 |
+-------------------+
MySQL > select count(distinct datetime) from log_statis group by datetime;
+-------------------------------+
| count(DISTINCT `datetime`) |
+-------------------------------+
| 71045 |
+-------------------------------+
##keyword COUNT