SQL Server 仅允许在CASE表达式中嵌套 10 个级别。 CASE表达式不能用于控制 Transact-SQL 语句、语句块、用户定义函数以及存储过程的执行流。 如需控制流方法的列表,请参阅控制流语言 (Transact-SQL)。 CASE表达式按顺序评估其条件并在满足第一个条件时停止。 在某些情况下,将会先计算表达式,然后CASE表达式会将表达式的
另请参阅 本机编译的存储过程的迁移问题 内存中 OLTP 不支持的 Transact-SQL 构造 其他资源 培训 模块 使用C# 中的 switch-case 结构将代码流分支 - Training 了解如何添加将一个变量或表达式与多个可能值相匹配的分支逻辑。
Transact-SQL (T-SQL) Reference xQuery xQuery Modules & Prologs - XQuery Prolog Modules & Prologs Type Casting Rules in XQuery XQuery Operators Against the xml Data Type XQuery Basics XQuery Expressions XQuery Functions against the xml Data Type XQuery Functions against the xml Data Type Functions...
CASE is one of the most powerful and more complex built-in expressions in Transact-SQL. Due to its name, this expression is regularly mistaken for the CASE statement available in some other languages. In SQL Server, the purpose of the CASE expression is to always return an expression. It’...
Syntax Remarks Example See also Executes one of several groups ofstatements, depending on the value of anexpression. Syntax Select Casetestexpression [Caseexpressionlist-n[statements-n]] [Case Else[elsestatements]] End Select TheSelect Casestatement syntax has these parts: ...
https://docs.microsoft.com/en-us/sql/t-sql/functions/row-number-transact-sql?view=sql-server-2017 Numbers the output of aresult set. More specifically,returns the sequential number of a row within a partition of a result set,starting at 1 for the first row in...
https://docs.microsoft.com/en-us/sql/t-sql/language-elements/case-transact-sql Evaluates a list of conditions and returns one of multiple possible res
case when in sql server's stored procedure https://docs.microsoft.com/en-us/sql/t-sql/language-elements/case-transact-sql Evaluates a list of conditions and returns one of multiple possible result expressions. The CASE expression hastwo formats:...
https://docs.microsoft.com/zh-cn/sql/t-sql/functions/left-transact-sql[转]sql语句中出现笛卡尔乘积 SQL查询入门篇 本篇文章中,主要说明SQL中的各种连接以及使用范围,以及更进一步的解释关系代数法和关系演算法对在同一条查询的不同思路. 多表连接简介 在关系数据库中,一个查询往往会涉及多个表,因为很少有...
在SQL Server中,您有一个名为Try_Cast的函数。https://docs.microsoft.com/en-us/sql/t-sql/functions/try-cast-transact-sql?view=sql-server-2017 我喜欢你可以把这句话放进案例陈述中: SELECT CASE WHEN TRY_CAST('tes 浏览39提问于2019-04-12得票数 1 ...