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...
SQL CASE Examples The following SQL goes through conditions and returns a value when the first condition is met: ExampleGet your own SQL Server SELECTOrderID, Quantity, CASE WHENQuantity >30THEN'The quantity is greater than 30' WHENQuantity =30THEN'The quantity is 30' ...
SQL在case中使用变量集 我想在查询中使用输入变量。输入变量应该是一个集合。 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)...
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...
an expression is evaluated before aCASEexpression receives the results of the expression as its input. Errors in evaluating these expressions are possible. Aggregate expressions that appear in WHEN arguments to aCASEexpression are evaluated first, then provided to theCASEexpression. For example, the ...
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...