在上面的例子中,根据不同的条件(condition1和condition2),CASE语句会返回不同的值('A'或'B')。然后,WHERE子句中的IN条件将选择具有这些返回值的客户。 SQL Server提供了丰富的功能和工具来支持开发和管理数据库。以下是一些相关的腾讯云产品和链接,可以帮助您更好地使用SQL Server: ...
是一种在SQL查询中使用条件语句和通配符进行筛选和过滤数据的方法。通过使用case语句,可以根据条件动态地选择不同的筛选条件。通配符则可以用来匹配特定的模式或字符。 在SQL中,Where子句用于在...
Performance – the database stops processingcasewhen it finds the firsttruecondition. Ordering the clauses so the most likely are at the top can make the expression faster. In most cases, this benefit is tiny so only worth considering when speed is critical. With yourcaseexpression in hand, ...
The CASE statement evaluates its conditions sequentially and stops with the first condition whose condition is satisfied. In some situations, an expression is evaluated before a CASE statement receives the results of the expression as its input. Errors in evaluating these expressions are possible. Aggr...
The case statement in SQL returns a value on a specified condition. We can use a Case statement in select queries along with Where, Order By, and Group By clause. It can be used in the Insert statement as well. In this article, we would explore the CASE statement and its various use...
It will return only married, unless the parameter is set to false and then it will ignore the condition and bring both. Luis C. General Disclaimer: Are you seriously taking the advice and code from someone from the internet without testing it? Do you at least understand it? Or can it ea...
WHEN condition_1 THEN result_1 WHEN condition_2 THEN result_2 … ELSE result END 1. 2. 3. 4. 5. 此时自上而下根据condition判断,取对应的值,都不满足的时候取最后的result。下面是一个例子: SELECT customerName, state, country FROM customers ...
A list of CaseWhenClause to evaluate condition and get result from. elseResult SqlExpression A value to return if no whenClauses matches, if any. Returns SqlExpression An expression representing a CASE statement in a SQL tree. Implements Case(IReadOnlyList<CaseWhenClause>, SqlExpression) ...
SQL中的 CASE 类似编程语言里的 if-then-else 语句,用做逻辑判断。可以用于SELECT语句中,也可以用在WHERE,GROUP BY 和 ORDER BY 子句;可以单独使用,也可以和聚合函数结合使用。 语法如下: CASEWHENcondition1THENresult1[WHENcondition2THENresult2][...][ELSEresult]END[ASalias_name]注:[]中的内容可省略 ...
in SQL You can use the CASE expression to insert data into a SQL Server table. The INSERT statement with CASE will scan for the required values and if found, insert values from THEN expression. INSERT INTO column_name VALUES (CASE expression WHEN condition1 THEN result1 WHEN condition2 THEN...