UTC_TIMESTAMP() Description Syntax Arguments Examples Constraints UTC_TIMESTAMP() Description Returns the current UTC date and time as a value in YYYY-MM-DD hh:mm:...
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...
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...
简介 GROUP BY 的算法 SCALAR GROUP BY MERGE GROUP BY HASH GROUP BY MERGE GROUP BY 与 HASH GROUP BY 的选择 DISTINCT 的算法 MERGE DISTINCT HASH DISTINCT 简介 聚合操作指的是将多行结果按照指定方式组合成一行。常见的...
Finding View Dependencies Finding Direct View Dependencies on a Table Finding Direct Dependencies on a Table Column Listing View Schemas Listing View Definitions Listing Nested...
Finding View Dependencies Finding Direct View Dependencies on a Table Finding Direct Dependencies on a Table Column Listing View Schemas Listing View Definitions Listing Nested...