TheELSEclause has no condition as it is executed if none of theWHENconditions are matched. For example, -- CASE condition with ELSE clause in SQLSELECTcustomer_id, first_name,CASEWHENcountry ='USA'THEN'United States of America'WHENcountry ='UK'THEN'United Kingdom'ELSE'Unknown Country'ENDASc...
SQL CASE Examples The following SQL goes through conditions and returns a value when the first condition is met: ExampleGet your own SQL Server SELECTOrderID, Quantity, CASE WHENQuantity >30THEN'The quantity is greater than 30' WHENQuantity =30THEN'The quantity is 30' ...
For example: 这是一个工作查询: select * from table_1 where key_1 in ('1', '2', '3') 但是我想用一个输入变量来替换集合 select * from table_1 where key_1 in (:input_set) 然后我将输入设置为::input_set=('1,2,3') 然而,我找不到一个办法让这个工作。 Thanks OldProgrammer. 我使...
In SQL, we use Order By clause to sort results in ascending or descending order. Suppose in a further example; we want to sort result in the following method. For Female employee, employee salaries should come in descending order For Male employee, we should get employee salaries in ...
In another example, the CASE statement in the WHERE clause consists of multiple WHEN conditions. SQL Server evaluates the first condition and checks for records satisfying the given conditions. -- source: https://www.MSSQLTips.comSELECTSalesOrderID,TerritoryID,ShipMethodID,BillToAddressIDFROM[Advent...
an expression is evaluated before aCASEexpression receives the results of the expression as its input. Errors in evaluating these expressions are possible. Aggregate expressions that appear in WHEN arguments to aCASEexpression are evaluated first, then provided to theCASEexpression. For example, the ...
Conditional statements are very prevalent when working with databases. For example, we can use the CASE keyword in SQL to provide a set of evaluated conditions. We can then execute the code block if a given statement is true. A case statement is similar to a nested if…else block which al...
The database can use a function-based index if theexactexpression of the index definition appears in an SQL statement—like in the example above. The execution plan confirms this: It is a regularINDEX RANGE SCANas described inChapter 1. The database traverses the B-tree and follows the lea...
an expression is evaluated before aCASEexpression receives the results of the expression as its input. Errors in evaluating these expressions are possible. Aggregate expressions that appear in WHEN arguments to aCASEexpression are evaluated first, then provided to theCASEexpression. For example, the ...
returns the False Value. Example: IF(1=1, ‘working’, ‘not working’) returns ‘working’ COALESCE( value1,value2,… ) The COALESCE function returns the fist not NULL value from the list of values. If all the values in the list are NULL, then it returns NULL. ...