Here, theCASEstatement checks if theamountis greater than or equal to400. If this condition is satisfied, a new columnoffer_pricewill contain the values equal toamount - amount * 10/100. CASE With Multiple Cond
SQL Server 数据库引擎可处理对多种数据存储体系结构(例如,本地表、已分区表以及分布在多个服务器上的表)执行的查询。 以下部分介绍了 SQL Server 如何处理查询并通过执行计划缓存来优化查询重用。执行模式SQL Server 数据库引擎可使用两种不同的处理模式处理 Transact-SQL 语句:...
In the tipSQL Server CASE Expression Overview, Aaron has written a section about data type precedence in the CASE expression. Nesting CASE Expressions With the searched CASE expression, we can have multiple WHEN conditions: SELECT [BusinessEntityID],[JobTitle],[HireDate],Seniority=CASE WHENDATEDIFF...
SQL Server allows for only 10 levels of nesting inCASEexpressions. TheCASEexpression can't be used to control the flow of execution of Transact-SQL statements, statement blocks, user-defined functions, and stored procedures. For a list of control-of-flow methods, seeControl-of-Flow Language (...
SQL Server allows for only 10 levels of nesting inCASEexpressions. TheCASEexpression can't be used to control the flow of execution of Transact-SQL statements, statement blocks, user-defined functions, and stored procedures. For a list of control-of-flow methods, seeControl-of-Flow Language (...
CASE表达式是用来判断条件的,条件成立时返回某个值,条件不成立时返回另一个值。 语法: CASEWHENComparsionConditionTHENresultWHENComparsionConditionTHENresultELSEotherEND (注:各分支返回的数据类型需一致。) (注:when子句一定要有排他性,因为当when子句为真时,剩余的when子句会被忽略。) ...
Is the name of an instance of a SQL Server that is hosted bysystem_nameorFCI_network_nameand that has HADR service is enabled. For a default server instance,instance_nameis optional. The instance name is case insensitive. On a named instance, this value name is the same as the value re...
Query hints specify that the indicated hints are used in the scope of a query. They affect all operators in the statement.
ALTER DATABASE statement failed. SQL Server Engine Backup Restore All 2138926 Improvement: The sp_invoke_external_rest_endpoint stored procedure is only supported in Azure SQL Database environments. If you try to use this procedure in on-premises environments, you'll receive a spurious...
How does the server process that statement? To find out, use EXPLAIN: mysql>EXPLAINSELECTCOLLATION_NAMEFROMINFORMATION_SCHEMA.COLLATION_CHARACTER_SET_APPLICABILITYWHERECHARACTER_SET_NAME='utf8mb4'\G***1. row***id:1select_type: SIMPLEtable: cs partitions:NULLtype: const possible_keys:PRIMARY,name...