SQL Server 在 CASE 運算式中只允許 10 層的巢狀層級。 CASE 運算式無法用於控制 Transact-SQL 陳述式、陳述式區塊、使用者定義函數及預存程序的執行流程。 如需流程控制方法的清單,請參閱流程控制語言 (Transact-SQL)。 CASE 運算式會依序評估其條件,並在滿足其條件的第一個條件時停止。 在某
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。有关控制流方法的列表,请参阅控制流语言 (Transact-SQL)。 示例 A. 使用带有 CASE 简单表达式的 SELECT 语句 在SELECT 语句中,CASE 简单表达式只能用于等同性检查,而不...
Applies to: SQL ServerThe lower-case function converts each character in $arg to its lower case equivalent. The Microsoft Windows binary case conversion for Unicode code points specifies how characters are converted to lower case. This standard is not identical to the mapping for Unicode code ...
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’...
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 ...