Because we defined the Staff column in the subquery, we can refer to it in the outer query. This makes re-using code much easier and it makes the SQL statement more compact and easier to maintain. If we would like to change the definition of Staff, we would need to alter it at only...
SQL_SRVC_ROW_SUBQUERY SQL_SQL92_STRING_FUNCTIONS 3.0 SQLUINTEGER 位掩码,枚举驱动程序和关联的数据源支持的字符串标量函数,如 SQL-92 中定义。以下位掩码用于确定支持哪些字符串函数:SQL_SSF_CONVERTSQL_SSF_LOWERSQL_SSF_UPPERSQL_SSF_SUBSTRINGSQL_SSF_TRANSLATESQL_SSF_TRIM_BOTHSQL_SSF_TRIM_LEADINGSQL_SSF...
USE sql_store; select *from customerswhere address like ‘%Trail%’ oraddress like ‘%avenue%’LIKE 执行优先级在逻辑运算符之后,毕竟 IN BETWEEN LIKE 本质可看作是比较运算符的简化,应该和比较运算同级,数学→比较→逻辑,始终记住这个顺序,上面这个如果用正则表达式会简单得多 where phone like ‘%9’/wh...
subquery-related keywords比如IN,ANY,SOME,EXISTS仅仅返回true或者false,而这非常适合使用where clause subquery 你也可以在UPDATE, DELETE STATEMENTS中的where clause中使用corelated subquery以便narrow down哪些row将可以被这条statement所影响。 下面的correlated query执行过程: selectdistincta.ProductID, a.UnitPriceas...
UPDATE [base].[dbo].[test] SET Idstatement = 20 WHERE Iddoc IN (SELECT [Iddoc] FROM [base].[dbo].[test] WHERE Document = 'INV' AND Idstatement = 50 AND Year = '2017' ) Subquery returned more than 1 value. The subquery cannot follow =, !=, <, <= , >, >= or be used ...
Query hints can be specified only in the top-level query, not in subqueries. When a table hint is specified as a query hint, the hint can be specified in the top-level query or in a subquery. However, the value specified for exposed_object_name in the TABLE HINT clause mus...
Query hints can be specified only in the top-level query, not in subqueries. When a table hint is specified as a query hint, the hint can be specified in the top-level query or in a subquery. However, the value specified...
The SQL subquery is a SELECT query that is embedded in the main SELECT statement. The subquery can be nested inside a SELECT, INSERT, UPDATE, or DELETE statement or inside another subquery.
SQL_SRVC_ROW_SUBQUERY SQL_SQL92_STRING_FUNCTIONS 3.0 SQLUINTEGER 位掩碼,列舉驅動程式和相關聯數據源所支援的字串純量函式,如 SQL-92 中所定義。下欄位遮罩可用來判斷支援哪些字串函式:SQL_SSF_CONVERTSQL_SSF_LOWERSQL_SSF_UPPERSQL_SSF_SUBSTRINGSQL_SSF_TRANSLATESQL_SSF_TRIM_BOTHSQL_SSF_TRIM_LEADING...
Cannot use an aggregate or a subquery in an expression used for the group by list of a GROUP BY clause. Cannot use the ROLLBACK statement within an INSERT-EXEC statement. Cant Drop Table capitalise the first letter of each word in a string in SQL Server. Capturing the results from exec ...