SCALAR GROUP BY HASH GROUP BY MERGE GROUP BY GROUP BY 算子主要用于在 SQL 中进行分组聚合计算操作。 用于对数据进行分组的算法有 HASH 算法和 MERGE 算法,因此根据算法可以将 GROUP BY 算子分为两种:HASH GROUP BY 和 MERGE GROUP BY。执行计划生成时...
NOT LIKE Description Syntax Examples NOT LIKE Description The NOT LIKE operator is used in a WHERE clause to search for a specified pattern in a column. There are tw...
TABLE Synopsis Examples MySQL compatibility See also TABLE The TABLE statement can be used instead of SELECT * FROM when no aggregation or complex filtering is needed. S...
Explain Statements Using Aggregation Example Hash Aggregation Explain Statements Using Aggregation The aggregation may be used in SQL, and the execution plan of the aggregate ...
UPDATE Description Syntax Single-table Syntax Explanations Examples UPDATE Description The UPDATE statement is used to modify the existing records in a table. Sy...
<>,!= Description Syntax Examples <>,!= Description The <>,!= operator returns true only if the left-hand operand is not equal to the right-hand operand. Syntax >...
>= Description Syntax Examples >= Description The >= operator returns true only if the left-hand operand is greater than or equal to the right-hand operand. Syntax...