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...
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
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...
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...
The key takeaway is that you should be careful with “else 0” when using CASE WHEN. It doesn’t have any effect with SUM, but it has a huge effect on AVG. 4. JOINs ON columns with missing values There are 4 different JOINs in SQL: Inner, Outer, Left and Right. When we use JOI...
-- Loading multiple LOBFILEs into the emp table. -- -- TO RUN THIS CASE STUDY: -- 1. Before executing this control file, log in to SQL*Plus as -- scott/tiger. Enter @ulcase9 to execute the SQL script for -- this case study. This prepares and populates tables and ...
I was trying the CASE WHEN in the WHERE clause of the SQL query, but not being a SQL expert, I wasn't successful with this method - I was able to get it to work with one entry, but not multiple values '66200, 66201' or blank (all values)) ...
Excel: =SUMIFIF(Ax:Ay, "Marvin*", Bx:By) SQL: suM(CASE WHEN A LIKE 'Marvin%' THEN B END) Sumif over multiple columns is done as the sum of one count function per column: Excel: =SUMIF(Ax:Cy, 42) SQL: SUM(CASE WHEN A = 42 THEN A END) + SUM(CASE WHEN B = 42 THEN ...
Multiple aggregations and the SQL table function: A case studyKanishka MandalNattavut Sutyanyong
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 ...