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...
sql中的case when的功能是实现单列或者多列的条件统计，其实Pandas也可以实现的，比如万能的apply方法，...
DECODE is considered the most powerful function in Oracle. Oracle 8i release introduced the CASE expression. The CASE expression can do all that DECODE does plus lot of other things including IF-THEN analysis, use of any comparison operator and checking multiple conditions, all in a SQL query i...
SQL CASE statement with Multiple THEN's I am wondering whether its possible to extract two seperate columns of data after a 'THEN' statement when using CASEFor exampleSelect country, CASE WHEN X>1 Then (code which allows 'A' in one column and 'B' in a second column)... END FROM ...
This includes stringing together multiple conditional statements using AND and OR. You can include multiple WHEN statements, as well as an ELSE statement to deal with any unaddressed conditions. Practice Problem Write a query that selects all columns from benn.college_football_players and adds an ...
In the tipSQL Server CASE Expression Overview, Aaron has written a section about data type precedence in the CASE expression. Nesting CASE Expressions With the searched CASE expression, we can have multiple WHEN conditions: SELECT [BusinessEntityID],[JobTitle],[HireDate],Seniority=CASE WHENDATEDIFF...
https://linuxhint.com/sql-case-statement/ This tutorial mainly focuses on building a nested case statement in conjunction with the WHEN clauses. Nested CASE WHEN Statements In SQL, we can use a set of nested CASE WHEN statements in SQL to evaluate the multiple conditions and return a differe...
将其 Package 在MAX中，以便将组中多行的值（包括NULL）"压缩"/聚合为单个值;如果所有的行都有NULL...
The CASE statement works like a simplified IF-THEN-ELSE statement and allows for multiple conditions to be tested. This starts with the keyword CASE followed by multiple conditionals statements. Each conditional statement consists of at least one pair of WHEN and THEN statements. Where WHEN specifie...