CASE Statement & Nested Case in SQL Server - shikshaglbe

A CASE statement is used to perform different actions based on different conditions. It is similar to an IF-THEN-ELSE statement, but with more than one condition.A NESTED CASE statement is a CASE statement that is used within another CASE statement. It allows you to test for multiple conditions within a single CASE statement.CASE statement is used for selection or setting a new value from a given set of values. It can be used in SELECT, UPDATE and DELETE statements. Nested CASE statement is used when there are multiple conditions to be checked. The inner CASE statement is executed first and the outer CASE statement is executed next.CASE statement is used to test a condition and return a value based on the result of the test. Nested CASE statement is used when there are multiple conditions to be tested. In SQL Server, you can use CASE in the SELECT list, WHERE clause, and ORDER BY clause.CASE statement syntax:CASEWHEN condition1 THEN result1ELSE result3CASE statement is used for various purposes such as to return different values on the basis of some conditions, to execute different code blocks based on some conditions, and so on. It can be used in various places such as in a SELECT clause, in a WHERE clause, or even in an ORDER BY clause.

Nested CASE statement is nothing but multiple CASE statements written inside each other. It is generally used when there are more than two conditions to be evaluated.SQL Server provides the CASE statement that allows you to select or display a result set based on conditions that you specify. You can use the CASE statement in a SELECT, UPDATE, or DELETE statement.The CASE statement has two forms: simple and searched. The simple CASE statement compares an expression to a set of discrete values and returns the corresponding value from another expression. The searched CASE statement evaluates a list of Boolean expressions to return one of the specified values.If none of the WHEN conditions are TRUE, the CASE statement returns the value in the ELSE clause, if an ELSE clause exists. If no WHEN clause is TRUE and no ELSE clause exists, no value is returned.The CASE statement is a control statement that allows you to select one of a number of options based on a condition. It is useful for tasks such as:-Selecting an action to perform based on the value of an expressionAssigning a value to a variable based on the value of an expressionPrinting different messages depending on the value of an expressionThe CASE statement has two forms: simple and searched. The simple form evaluates an expression and, if the result is TRUE, executes a statement. If the result is FALSE, it skips the statement. The searched form evaluates multiple conditions and, when it finds one that is TRUE, executes a corresponding SQL Server statement. If no conditions are TRUE, it skips all statements in the CASE block.


Tags:

case statement & nested case in sql servercase statement & nested case in sql server alter tablecase statement & nested case in sql server alteryxcase statement & nested case in sql server altercase statement & nested case in sql server alter columncase statement & nested case in sql server agentcase statement & nested case in sql server after deletecase statement and nested case in sql server betweencase statement and nested case in sql server bigquerycase statement and nested case in sql server by namecase statement and nested case in sql server books onlinecase statement and nested case in sql server case statementcase statement and nested case in sql server c#case statement and nested case in sql server ctecase statement and nested case in sql server case sensitivecase statement and nested case in sql server configuration managercase statement and nested case in sql server columncase statement and nested case in sql server conditioncase statement and nested case in sql server clausecase statement & nested case in sql server developer editioncase statement & nested case in sql server databasecase statement & nested case in sql server data toolscase statement & nested case in sql server dbcase statement & nested case in sql server dbacase statement & nested case in sql server dynamicallycase statement and nested case in sql server examplecase statement and nested case in sql server errorcase statement and nested case in sql server elsecase statement and nested case in sql server functioncase statement and nested case in sql server forcase statement and nested case in sql server from excelcase statement and nested case in sql server for datenested case statement sql servercase statement and nested case in sql server group bycase statement and nested case in sql server grantcase statement and nested case in sql server howcase statement and nested case in sql server havingcase statement and nested case in sql server hanacase statement and nested case in sql server having clausecase statement and nested case in sql server ifcase statement and nested case in sql server iifcase statement and nested case in sql server in oraclecase statement and nested case in sql server in ordercase statement and nested case in sql server interview questionscase statement and nested case in sql server in dayscase statement and nested case in sql server instancecase statement and nested case in sql server joincase statement and nested case in sql server javacase statement and nested case in sql server jobcase statement and nested case in sql server jdbccase statement and nested case in sql server jump issuecase statement and nested case in sql server jump startcase statement and nested case in sql server kafkacase statement and nested case in sql server keycase statement and nested case in sql server keywordcase statement and nested case in sql server kipcase statement and nested case in sql server likecase statement and nested case in sql server loopcase statement and nested case in sql server limitcase statement and nested case in sql server management studiocase statement and nested case in sql server microsoftcase statement and nested case in sql server multiple conditionscase statement and nested case in sql server multiplecase statement and nested case in sql server mscase statement & nested case in sql server not workingcase statement & nested case in sql server namecase statement & nested case in sql server notcase statement & nested case in sql server not nullcase statement & nested case in sql server native clientcase statement and nested case in sql server oraclecase statement and nested case in sql server onlinecase statement and nested case in sql server order bycase statement and nested case in sql server orcase statement and nested case in sql server object explorercase statement and nested case in sql server objectscase statement and nested case in sql server performancecase statement and nested case in sql server performance tuningcase statement and nested case in sql server pivotcase statement and nested case in sql server procedurecase statement and nested case in sql server profilercase statement and nested case in sql server pdfcase statement and nested case in sql server querycase statement and nested case in sql server query examplecase statement and nested case in sql server query resultscase statement and nested case in sql server reporting servicescase statement and nested case in sql server resultcase statement and nested case in sql server replicationcase statement and nested case in sql server returns 0case statement and nested case in sql server report buildercase statement and nested case in sql server stored procedurecase statement and nested case in sql server scriptcase statement and nested case in sql server sqlcase statement and nested case in sql server syntaxcase statement and nested case in sql server selectcase statement and nested case in sql server select statementcase statement and nested case in sql server select querycase statement and nested case in sql server switchcase statement and nested case in sql server tablecase statement and nested case in sql server teradatacase statement and nested case in sql server tutorialcase statement and nested case in sql server to writecase statement and nested case in sql server thencase statement and nested case in sql server then elsecase statement and nested case in sql server using querycase statement and nested case in sql server usingcase statement and nested case in sql server using row_numbercase statement and nested case in sql server using c#case statement and nested case in sql server viewcase statement and nested case in sql server vbacase statement and nested case in sql server vb.netcase statement and nested case in sql server variablecase statement and nested case in sql server versionscase statement and nested case in sql server with examplecase statement and nested case in sql server where clausecase statement and nested case in sql server wherecase statement and nested case in sql server w3schoolscase statement and nested case in sql server writecase statement and nested case in sql server xp_cmdshellcase statement and nested case in sql server xpathcase statement and nested case in sql server xmlcase statement and nested case in sql server xpcase statement & nested case in sql server youtubecase statement & nested case in sql server yearcase statement & nested case in sql server youtube videocase statement & nested case in sql server yyyy-mm-ddcase statement and nested case in sql server z/oscase statement and nested case in sql server zscalercase statement and nested case in sql server z indexcase statement and nested case in sql server zabbix