CUBE 子句是用來根據 GROUP BY 子句中指定的群組數據行組合來執行匯總。 CUBE 是GROUPING SETS 的簡寫。例如: SQL 複製 GROUP BY warehouse, product WITH CUBE 或 SQL 複製 GROUP BY CUBE(warehouse, product) 相當於: SQL 複製 GROUP BY GROUPING SETS((warehouse, product), (warehouse), (p...
-- This example creates a memory-optimized table with a columnstore index. CREATE TABLE t_account ( accountkey int NOT NULL PRIMARY KEY NONCLUSTERED, Accountdescription nvarchar (50), accounttype nvarchar(50), unitsold int, INDEX t_account_cci CLUSTER...
You saw with UNION and UNION ALL via examples that they do not do quite the same thing as what a join does. They only bind fields on top of one another in the two tables. UNION SELECTidFROMleft_oneUNIONSELECTidFROMright_oneORDERBYid; UNION ALL INTERSECT SELECTidFROMleft_oneINTERSECTSELEC...
GROUP BY column-expression [ ,...n ] Groups the SELECT statement results according to the values in a list of one or more column expressions. For example, this query creates a Sales table with columns for Country, Region, and Sales. It inserts four rows and two of the rows have matchin...
Often you want to see if two tables have the same data content. For example, to check data loads worked, verify query changes return the same data or see what’s changed recently. The basic way to do this is with set operations: ...
We can also join more than two tables using JOIN. For example,-- join three tables: Customers, Orders, and Shippings SELECT Customers.first_name, Orders.item, Shippings.status FROM Customers JOIN Orders ON Customers.customer_id = Orders.customer_id JOIN Shippings ON Customers.customer_id = ...
Alias for ColumnsTwo AliasesAlias for Tables Examples Explained SQL Joins INNER JOINLEFT JOINRIGHT JOINSelf JOIN Examples Explained SQL UNION UNIONUNION ALLUNION With WHEREUNION ALL With WHERE SQL GROUP BY Examples Explained SQL HAVING HAVING and GROUP BYHAVING and ORDER BY ...
因为distinct可能使用group by,了解MySQL如何处理按order by 列或者具有不属于所选列的子句。见12.20.3节, “MySQL Handling of GROUP BY”. In most cases, a DISTINCT clause can be considered as a special case of GROUP BY. For example, the following two queries are equivalent: ...
BinaryNode,二元节点,表示 JOIN,GROUP BY 等操作 代码语言:javascript 复制 /** * A logical plan node with no children. */trait LeafNodeextendsLogicalPlanwithLeafLike[LogicalPlan]/** * A logical plan node with single child. */trait UnaryNodeextendsLogicalPlanwithUnaryLike[LogicalPlan]/** * A ...
WITH ( ) 指定查询优化器对此表和此语句使用优化或锁定策略。有关详细信息,请参阅表提示 (Transact-SQL)。 rowset_function 指定其中一个行集函数(如 OPENROWSET),该函数返回可用于替代表引用的对象。有关行集函数的列表的详细信息,请参阅行集函数 (Transact-SQL)。 使用OPENROWSET ...