SHOW [GLOBAL|SESSION] BINDINGS 语法图 语法说明 示例 MySQL 兼容性 另请参阅 SHOW [GLOBAL|SESSION] BINDINGS SHOW BINDINGS 语句用于显示创建过的 SQL 绑定的相关信息。BINDING 语句可以在 GLOBAL 或者 SESSION 作用域内显示执行计划...
TRIM() Description Syntax Arguments Examples TRIM() Description This function TRIM() returns the string str with all remstr prefixes or suffixes removed. If none of...
DATE() Description Syntax Arguments Examples Constraints DATE() Description Extracts the date part of the date or datetime expression expr. Syntax > DATE ( exp...
COALESCE() Description Syntax Arguments Examples COALESCE() Description The COALESCE() function returns the first non-null value in a list. Syntax > COALESCE ( ...
Subqueries with IN 语法描述 语法结构 示例 限制 Subqueries with IN 语法描述 子查询可以与 IN 操作符一起使用,作为 “表达式 IN (子查询)”,查询某个范围内的数据。子查询应该返回带有一行或多行的单个列,以形成 IN 操作使用的值列表。 对多记录、单列子查询使用 IN 子句。...
< Description Syntax Examples < Description The < operator returns true only if the left-hand operand is less than the right-hand operand. Syntax > SELECT x < ...
< Description Syntax Examples < Description The < operator returns true only if the left-hand operand is less than the right-hand operand. Syntax > SELECT x < ...