T-SQL Part VIII: CROSS APPLY, OUTER APPLY 除了CROSS JOIN, INNER JOIN, OUTER JOIN之外,T-SQL还提供了CROSS APPLY和OUTER APPLY这两个较为另类的Set操作符。 首先来看CROSS APPLY。跟CROSS JOIN一样,MSDN只在FROM Clause的文档中做了一个介绍,如下: Both the left and right operands of the APPLY operato...
Cross Apply使表可以和表值函数结果进行join,在下面的示例中建了两个表和一个表值函数,T_b的列a_ids中会存放a表的id用,分割的字符串连接;我们通过cross apply使T_a,T_b表通过splitIDs inner join连接。请看示例:GO ifobject_id('T_a','U')isnotnull droptableT_a GO CREATETABLET_a(idintuniquenotnu...
必须扩展存储在各个字段中的 JSON 数组,并将它们与其父行联接时,通常使用 Transact-SQL CROSS APPLY 运算符。 有关 CROSS APPLY 的详细信息,请参阅FROM (Transact-SQL)。 可以通过将OPENJSON与要返回的行的显式定义架构一起使用,来重写相同查询: SQL
OUTER APPLY returns both rows that produce a result set, and rows that do not, with NULL values in the columns produced by the table-valued function. APPLY was the topic of the month for T-SQL Tuesday #17 (it's a monthly blog party on the second Tuesday of the month). The original...
derived_table 可以使用 Transact-SQL 資料表值建構函式功能來指定多個資料列。 例如: SELECT * FROM (VALUES (1, 2), (3, 4), (5, 6), (7, 8), (9, 10) ) AS MyTable(a, b);。 如需詳細資訊,請參閱資料表值建構函式 (Transact-SQL)。
derived_table 可以使用 Transact-SQL 資料表值建構函式功能來指定多個資料列。 例如: SELECT * FROM (VALUES (1, 2), (3, 4), (5, 6), (7, 8), (9, 10) ) AS MyTable(a, b);。 如需詳細資訊,請參閱資料表值建構函式 (Transact-SQL)。
Array data type in SQL server Array's IN SQL SERVER? ASCII values for extended characters Assign empty string '' if datetime is null Assign EXEC output to Variable Assigning NULL value to column name using Case Statement of where is SQL SERVER 2008 atomic if not exists() and insert or upd...
SQL Server requires you to specify explicitly the list of values in the IN clause to rotate to result columns. You can't use a static query and have SQL Server figure out all distinct values in OrderYear. To achieve this, you have to use dynamic execution to construct the query string ...
ASCII values for extended characters Assign empty string '' if datetime is null Assign EXEC output to Variable Assigning NULL value to column name using Case Statement of where is SQL SERVER 2008 atomic if not exists() and insert or update Attempt to fetch logical page (1:155534) in data...
For example, SELECT * FROM (VALUES (1, 2), (3, 4), (5, 6), (7, 8), (9, 10) ) AS MyTable(a, b);. For more information, see Table Value Constructor (Transact-SQL). column_alias An optional alias to replace a column name in the result set of the derived table. Include ...