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586 B
586 B
STDDEV,STDDEV_POP
Description '35;'35;' 35; Syntax
"`stddev (expl)'
Returns the standard deviation of the expr expression
'35;'35; example
MySQL > select stddev(scan_rows) from log_statis group by datetime;
+---------------------+
| stddev(`scan_rows`) |
+---------------------+
| 2.3736656687790934 |
+---------------------+
MySQL > select stddev_pop(scan_rows) from log_statis group by datetime;
+-------------------------+
| stddev_pop(`scan_rows`) |
+-------------------------+
| 2.3722760595994914 |
+-------------------------+
##keyword STDDEV,STDDEV_POP,POP