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 specifies...
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...
不然会导致转换无效. SELECT id, case WHEN cast(`status` AS SIGNED) < 45 THEN '1' WHEN cast(...
Adding multiple conditions to a CASE statement You can also define a number of outcomes in a CASE statement by including as many WHEN/THEN statements as you'd like: SELECT player_name, weight, CASE WHEN weight > 250 THEN 'over 250' WHEN weight > 200 THEN '201-250' WHEN weight > 175...
SETDATEFIRST1-- first day of the week is a MondaySELECTCASEWHENDATEPART(WEEKDAY,GETDATE())=1THEN'Monday'ELSE'Not a Monday'END The following SQL script does the same, but rather uses the IF … ELSE construct to switch between two different statements, instead of calculating the result in ...
The searched CASE statement evaluates multiple Boolean expressions and executes the sequence of statements associated with the first condition that evaluates to TRUE. The searched CASE statement has the following structure: CASE WHEN condition_1 THEN statements_1 WHEN condition_2 THEN statements_2 ......
select sal, case when sal < 2000 then 'category 1' when sal < 3000 then 'category 2' when sal < 4000 then 'category 3' else 'category 4' end from emp; E.g.: The requirement is to find out the count of employees for various conditions as given below. There are multiple ways of...
Different Formats of CASE Statements A simple CASE statement expression In this format, we evaluate one expression against multiple values. In a simple case statement, it evaluates conditions one by one. Once the condition and expression are matched, it returns the expression mentioned in THEN cla...
CASEcan be used in any statement or clause that allows a valid expression. For example, you can useCASEin statements such as SELECT, UPDATE, DELETE and SET, and in clauses such as, IN, WHERE, ORDER BY, and HAVING. Transact-SQL syntax...
multiple conditional expressions in a single CASE expression. When you have multiple conditional expressions in your CASE clause, the first expression that evaluates to TRUE will be the code block that is evaluated by your TSQL statement. To better understand how the CASE expression works I will ...