这里,我还需要说明的是,case可以和select,check,update等一起配合使用,相当于增加了SQL操作的条件分析,是的SQL写的可以更加强大。 1. select的配合用法 1Examples:2MariaDB> SELECT CASE 1 WHEN 1 THEN 'one'3-> WHEN 2 THEN 'two' ELSE 'more'END;4-> 'one'5MariaDB> SELECT CASE WHEN 1>0 THEN '...
-- add a new column 'order_volume' in the Orders table-- and flag any order greater than 10000 as 'Large Order'-- and smaller than 10000 as 'Small Order'SELECT*,CASEWHENamount >=10000THEN'Large Order'WHENamount <10000THEN'Small Order'ENDAS'order_volume'FROMOrders; Here, the result se...
SQL CASE ExamplesThe following SQL goes through conditions and returns a value when the first condition is met:ExampleGet your own SQL Server SELECT OrderID, Quantity,CASE WHEN Quantity > 30 THEN 'The quantity is greater than 30' WHEN Quantity = 30 THEN 'The quantity is 30' ELSE 'The ...
The following examples will make the use of CASE expression more clear. E.g.: Returning categories based on the salary of the employee. 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 fro...
The same behavior can be obtained in SQL by using a case expression inside the count function: SQL: COUNT(CASE WHEN <condition> THEN 1 END) In Excel, the defines arbitrary cells—Ax:Ay in the following examples. In SQL, the picking the rows is separate from the picking of the columns...
CASE WHEN <condition> THEN <expression if true> ELSE <expression if false> END The ELSE argument is optional. The example given in the introduction uses this format. Let’s take a look at some examples using theEmployeetable in theHumanResourcesschema. ...
The complete guide to SQL IF. Learn the syntax, parameters, use cases and find practical examples in the Hightouch SQL Dictionary.
Like SQL "case when" statement and Swith statement from popular programming languages, Spark SQL Dataframe also supports similar syntax using "when otherwise" or we can also use "case when" statement.
In the following example, we want to get Product name for ProductID 4.it does not satisfy Case statement condition; therefore, it gave output from Else expression. Let us explore a few examples of the Case statement in SQL. Before we proceed, create a sample table and insert few records...
Master SQL CASE to conditionally return values in queries. Learn syntax and practical examples for using CASE expressions to handle multiple conditions.