We can add as manyWHEN ... THENconditions as required in theCASEstatement. For example, -- multiple CASE conditions in SQLSELECTcustomer_id, first_name,CASEWHENcountry ='USA'THEN'United States of America'WHENco
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...
We have following syntax for a case statement in SQL with a simple expression 1 2 3 4 5 6 SELECT CASE Expression When expression1 Then Result1 When expression2 Then Result2 ... ELSE Result END Usually, we store abbreviations in a table instead of its full form. For example, in my...
This Oracle tutorial explains how to use the Oracle/PLSQLCASE statementwith syntax and examples. Description The Oracle/PLSQL CASE statement has the functionality of an IF-THEN-ELSE statement. Starting in Oracle 9i, you can use the CASE statement within a SQL statement. Syntax The syntax for ...
When the IF THEN statement has no ELSE clause and the condition is false, PL/SQL raises an error. Simple CASE statement example The following example uses a simple CASE statement to compare a single value (c_grade) with many possible values ‘A’, ‘B’,’C’, ‘D’, and ‘F’: ...
There are two main types of CASE statements in SQL: simple CASE searched CASE They differ in how they compare values or evaluate conditions. 3.1. Simple CASE To begin with,a simple CASE statement compares an expression to one or more possible values. It has a simple format: ...
SQL: CASE Statement 1.CASE 写法如下: CASE WHEN condition1 THEN result1 WHEN condition2 THEN result2 WHEN conditionN THEN resultN ELSE result END; 解释:1)先匹配第一条,不匹配的话继续第二条,如此循环,
For example, if the value of the variable is equal to constant2, the code after case constant2: is executed until the break statement is encountered. If there is no match, the code after default: is executed. Note: We can do the same thing with the if...else..if ladder. However, ...
SQL Case Statement It is possible to extend the same SQL query using CASE statement with additional WHEN clauses as follows begin declare integer @i; @i = cast( (RAND() * 10) as integer); select 'My random number ' || cast(@i as varchar(3)) || ' is ' || ...
CASE 语句在指定的搜索条件为 true 时执行一条或多条语句。 CASE 是独立的语句,它与必须作为表达式组成部分出现的 CASE 表达式不同。 CASE 语句有两种形式:简单 CASE 语句和搜索型 CASE 语句。 简单CASE 语句 (PL/SQL) 简单CASE 语句尝试将表达式 (称为选择器) 与一个或多个 WHEN 子句中指定的另一个表达式...