sql case statement
SELECTcolumn1, column2, ...CASEWHENcondition1THENresult1WHENcondition2THENresult2-- Add more WHEN conditions and results as neededENDASalias_nameFROMtable_name; We can add as manyWHEN ... THENconditions as required in theCASEstatement. For example, -- multiple CASE conditions in SQLSELECTcusto...
CASEWHEN([ul].[IsDisabled]=1OR[l].[IsDisabled]=1)THENcast(1asbit)WHEN(NOT([ul].[IsDisabled]=1OR[l].[IsDisabled]=1))THENcast(0asbit)ENDAS[IsDisabled]
CASE { WHEN boolean_expression THEN {statement;} … }… [ ELSE {statement;}… ] END CASE [ label_name ]; simple_case_statement ::= [ <> ]CASE case_operand{ WHEN when_operand THEN {statement;} … }…[ ELSE {statement;}… ]END CASE [ label_name ]; '———–1....
SQL还可以在一个SELECT语句或UPDATE语句中,表达与面向过程语言一样非常复杂而且灵活的条件分支,不过这需要借助CASE表达式。 之所以叫它CASE“表达式”而不是CASE“语句”(statement),是因为CASE表达式与1+(2-4)或者(x*y)/z一样,都是表达式,在执行时会被整体当作一个值来处理。既然同样是表达式,那么能写1+1这样...
1topics: #CASE的两种基本用法2CASE OPERATOR3CASE STATEMENT45MariaDB [mysql]> helpcasestatement; #case的第一种用法6Name: 'CASE STATEMENT'7Description:8Syntax:9CASE case_value10WHEN when_value THEN statement_list11[WHEN when_value THEN statement_list] ...12[ELSE statement_list]13END CASE1415Or...
The simple CASE statement has the following structure: CASE selector WHEN selector_value_1 THEN statements_1 WHEN selector_value_1 THEN statement_2 ... ELSE else_statements END CASE; Code language: PostgreSQL SQL dialect and PL/pgSQL (pgsql) Let’s examine the syntax of the simple CASE ...
SELECTTOP20SUBSTRING(ST.text, (QS.statement_start_offset/2) +1, ((CASEstatement_end_offsetWHEN-1THENDATALENGTH(ST.text)ELSEQS.statement_end_offsetEND- QS.statement_start_offset)/2) +1)ASstatement_text ,CONVERT(DECIMAL(10,2), max_grant_kb /1024.0)ASmax_grant_mb ,CONVERT(DECIMAL(10,...
在PL/SQL中,CASE语句用于在程序中执行条件分支。它可以根据给定的条件执行不同的代码块。 CASE语句有两种形式:简单CASE表达式和搜索CASE表达式。 简单CASE表达式的语法如下: CASE expression WHEN value1 THEN statement1; WHEN value2 THEN statement2; WHEN value3 THEN statement3; ... ELSE statementN; END ...
SELECT STATEMENT Optimizer=CHOOSE CONCATENATION TABLEACCESS (BY INDEX ROWID) OF LODGING INDEX(RANGE SCAN ) OF LODGING$MANAGER (NON-UNIQUE) TABLEACCESS (BY INDEX ROWID) OF LODGING INDEX(RANGE SCAN ) OF LODGING$MANAGER (NON-UNIQUE) tiger: ...