sql case statement
Simple CASE Statement In this article, we are going to use thefilmtable of thecinemadatabase. Let’s suppose that we want to create a new categorical column based on the values of ROI (gross to budget ratio): SELECTtitle,gross,budget,gross/budgetASROI,CASEWHENgross/budget<1THEN'low ROI'...
2.举例: SELECTOrderID, Quantity,CASEWHENQuantity>30THEN'The quantity is greater than 30'WHENQuantity=30THEN'The quantity is 30'ELSE'The quantity is under 30'ENDASQuantityTextFROMOrderDetails; SELECTCustomerName, City, CountryFROMCustomersORDERBY(CASEWHENCityISNULLTHENCountryELSECityEND); 以上例子等...
Learn how to use the SQL CASE statement to perform conditional logic in your SQL queries effectively.
Using a SQL Server Case Statement for IF/Else Logic Using the CASE expression instead of dynamic SQL in SQL Server SQL Server CASE Expression Overview SQL Server CASE Statement Example If you’d like to learn more about SQL, you can check out the follow resources: ...
In Case statement, we defined conditions. Once a condition is satisfied, its corresponding value is returned. Similarly, if we change the condition in a Case statement in SQL, it returns appropriate expression. In the following example, we want to get Product name for ProductID 4.it does ...
The SQL CASE statement is used to check conditions and perform tasks on each row while selecting data. In this tutorial, you will learn about the SQL CASE statement with the help of examples.
簡式case 陳述式: 用來根據文字值輸入部分邏輯 搜尋的 case 陳述式: 用來根據表示式的值輸入部分邏輯 CASE 陳述式的 WHEN 子句定義當滿足時決定控制流程的值。 以下是具有含簡式 case-statement-when-clause 之 CASE 陳述式的 SQL 程序範例: CREATE PROCEDURE UPDATE_DEPT (IN p_workdept) LANGUAGE SQL BEGIN ...
1topics: #CASE的两种基本用法2CASE OPERATOR3CASE STATEMENT45MariaDB [mysql]> helpcasestatement; #case的第一种用法6Name: 'CASE STATEMENT'7Description:8Syntax:9CASE case_value10WHEN when_value THEN statement_list11[WHEN when_value THEN statement_list] ...12[ELSE statement_list]13END CASE1415Or...
SQL还可以在一个SELECT语句或UPDATE语句中,表达与面向过程语言一样非常复杂而且灵活的条件分支,不过这需要借助CASE表达式。 之所以叫它CASE“表达式”而不是CASE“语句”(statement),是因为CASE表达式与1+(2-4)或者(x*y)/z一样,都是表达式,在执行时会被整体当作一个值来处理。既然同样是表达式,那么能写1+1这样...