在SQL语句中使用IF或CASE with multiple条件的作用是根据不同的条件执行不同的操作或返回不同的结果。这些条件可以是基于列的值、函数的结果、逻辑表达式等。 使用IF语句可以根据条件执行不同的操作。IF语句的基本语法如下: 代码语言:txt 复制 IF condition THEN statement1; ELSE statement2; END IF; 其中,conditio...
CASE With Multiple Conditions It is also possible to stack multiple conditions inside a singleCASEclause. Syntax SELECTcolumn1, column2, ...CASEWHENcondition1THENresult1WHENcondition2THENresult2-- Add more WHEN conditions and results as neededENDASalias_nameFROMtable_name; We can add as manyWHEN...
I am wondering whether its possible to extract two seperate columns of data after a 'THEN' statement when using CASE For example Select country, CASE WHEN X>1 Then (code which allows 'A' in one column and 'B' in a second column)... END
The functionality of the AND and OR operators do not change even in the case of SQL joins. SQL Multiple Joins Example To understand how to work with joins on multiple conditions, it is best to work with an example. For this demonstration, we use the Sakila database which was developed to...
Nesting CASE Expressions With the searched CASE expression, we can have multiple WHEN conditions: SELECT [BusinessEntityID],[JobTitle],[HireDate],Seniority=CASE WHENDATEDIFF(YEAR,[HireDate],GETDATE())>10 THEN'Longer than 10 years'WHENDATEDIFF(YEAR,[HireDate],GETDATE())=10 THEN'Exactly 10 ye...
CASE STATEMENT RETURNING MULTIPLE ROWS Case Statement returning multiple values CASE statement returns "Invalid Column Name" Error Case statement that increments variable with 1 is giving error Case Statement using Divide CASE Statement when not null , else if Help Case statement with Between in Where...
图1:CASE语法的表达 By reviewing the two different formats for the CASE expression in Figure 1 you can see how each format provides a different way to identify one of multiple expressions that determine the results of the CASE expression. With both types of CASE, a Boolean test is performed ...
between network interfaces,security groups,and virtual machines.Considering the complexity,the verbose query might be the best approachformaintainability and debugging purposes.Compact queries can be harder to debug and understand,especially when dealingwithnestedJSONBstructures and multipleJOINconditions. ...
Evaluates a list of conditions and returns one of multiple possible result expressions. TheCASEexpression has two formats: The simpleCASEexpression compares an expression to a set of simple expressions to determine the result. The searchedCASEexpression evaluates a set of Boolean expressions to determin...
Master SQL CASE to conditionally return values in queries. Learn syntax and practical examples for using CASE expressions to handle multiple conditions.