Section 12.20.1, “Aggregate Function Descriptions” Section 12.20.1, “Aggregate Function Descriptions” Section 8.2.1.21, “Window Function Optimization” Section 12.20.1, “Aggregate Function Descriptions” Section 8.2.1.21, “Window Function Optimization” Section 11.2, “Date and Time Data Types” Section 12.7, “Date and Time Functions” Section 10.16, “MySQL Server Locale Support” Section B.3.4.2, “Problems Using DATE Columns” Section 12.8.1, “String Comparison Functions and Operators” Section 12.7, “Date and Time Functions” Section 12.13, “Bit Functions and Operators” Section 12.8, “String Functions and Operators” Section 12.8.3, “Character Set and Collation of Function Results” Section 13.1.15, “CREATE INDEX Statement” Section 12.8, “String Functions and Operators” Section 6.2.22, “SQL-Based Account Activity Auditing” Section 12.8, “String Functions and Operators” Section 12.7, “Date and Time Functions” Section 12.20.1, “Aggregate Function Descriptions” Section 12.20.1, “Aggregate Function Descriptions” Section 13.7.4.1, “CREATE FUNCTION Statement for Loadable Functions” Section 11.2.1, “Date and Time Data Type Syntax” Section 8.2.1.17, “GROUP BY Optimization” Section 12.24, “Miscellaneous Functions” Section 8.2.2.4, “Optimizing Derived Tables, View References, and Common Table Expressions with Merging or Materialization” Section B.3.4.3, “Problems with NULL Values” STDDEV() STDDEV_POP() STDDEV_SAMP() STR_TO_DATE() STRCMP() SUBDATE() SUBSTR() SUBSTRING() SUBSTRING_INDEX() SUBTIME() SUM( SUM() 5714