In the T-SQL scripting language, you can use the SQL CASE statement to evaluate a condition and return one or more result expressions. This SQL Tutorial will teach you when and how you can use CASE in T-SQL statements. Solution TheCASE expressionis used to build IF … THEN … ELSE stat...
TheELSEclause has no condition as it is executed if none of theWHENconditions are matched. For example, -- CASE condition with ELSE clause in SQLSELECTcustomer_id, first_name,CASEWHENcountry ='USA'THEN'United States of America'WHENcountry ='UK'THEN'United Kingdom'ELSE'Unknown Country'ENDASc...
Simple SQL CASE Example Here is the syntax for the SQLCASEexpression: CASE WHENcondition_1THENresult_1 WHENcondition_2THENresult_2 ELSEelse_result END In this syntax, SQLCASEmatches the value with eithercondition_1orcondition_2. If a match is found, the statement will return the corresponding...
For example: 这是一个工作查询: select * from table_1 where key_1 in ('1', '2', '3') 但是我想用一个输入变量来替换集合 select * from table_1 where key_1 in (:input_set) 然后我将输入设置为::input_set=('1,2,3') 然而,我找不到一个办法让这个工作。 Thanks OldProgrammer. 我使...
In SQL, we use Order By clause to sort results in ascending or descending order. Suppose in a further example; we want to sort result in the following method. For Female employee, employee salaries should come in descending order For Male employee, we should get employee salaries in ...
在SQL Case语句中,使用URL作为条件进行判断。例如,可以使用URL的一部分或完整URL作为条件。 在Case语句的THEN子句中,可以执行与URL相关的操作,如插入、更新或删除数据。 下面是一个示例SQL Case语句,演示如何将URL添加到其中: 代码语言:txt 复制 SELECT CASE WHEN url LIKE '%example.com%' THEN 'URL包含example...
Conditional statements are very prevalent when working with databases. For example, we can use the CASE keyword in SQL to provide a set of evaluated conditions. We can then execute the code block if a given statement is true. A case statement is similar to a nested if…else block which al...
The database can use a function-based index if theexactexpression of the index definition appears in an SQL statement—like in the example above. The execution plan confirms this: It is a regularINDEX RANGE SCANas described inChapter 1. The database traverses the B-tree and follows the lea...
In the above example, the WHEN/THEN statements will get evaluated in the order that they're written. So if the value in the weight column of a given row is 300, it will produce a result of "over 250." Here's what happens if the value in the weight column is 180, SQL will do ...
Note that a simple CASE expression is a special case of a searched CASE expression. As an example, the following two CASE expressions are identical: Simple CASE Expression: SELECT Store_Name, CASE Store_Name WHEN 'Los Angeles' THEN Sales * 2 WHEN 'San Diego' THEN Sales * 1.5 ELSE ...