TRUNCATE Synopsis Examples MySQL compatibility See also TRUNCATE The TRUNCATE statement removes all data from the table in a non-transactional way. TRUNCATE can be thought...
ALTER TABLE Description Syntax Explanations Examples Constraints ALTER TABLE Description ALTER TABLE is used to modify the existing data table structure. Syntax ...
INTERSECT Description Syntax Examples INTERSECT Description INTERSECT returns only the different rows of two or more queries. Syntax SELECT column_list FROM table_...
< 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 < ...
INTERSECT Description Syntax Examples INTERSECT Description INTERSECT returns only the different rows of two or more queries. Syntax SELECT column_list FROM table_...
Hint的错误、冲突及告警 Hint的错误、冲突及告警 Plan Hint的结果会体现在计划的变化上,可以通过explain来查看变化。 Hint中的错误不会影响语句的执行,只是不能生效,该错误会根据语句类型以不同方式提示用户。对于explain语句,hint的错误会以warning形式显示在界面上,对于非explain语句,会以debug1级别日志...
Hint的错误、冲突及告警 Hint的错误、冲突及告警 Plan Hint的结果会体现在计划的变化上,可以通过explain来查看变化。 Hint中的错误不会影响语句的执行,只是不能生效,该错误会根据语句类型以不同方式提示用户。对于explain语句,hint的错误会以warning形式显示在界面上,对于非explain语句,会以debug1级别日...