sql case statement
Hi, I am trying to get data from a table to a datapage calculated field based on conditions that are chosen in the data page.. I get to work without any CASE & WHEN conditions i.e. if I only have to SELECT from one column, but that only takes me halfway.
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...
condition_1, condition_2, ... condition_n The conditions that must all be the same datatype. The conditions are evaluated in the order listed. Once aconditionis found to be true, the CASE statement will return the result and not evaluate the conditions any further. result_1, result_2, ...
CASE WHEN condition_1 THEN statements_1 WHEN condition_2 THEN statements_2 ... WHEN condition_n THEN statements_n [ ELSE else_statements ] END CASE;] Code language: PostgreSQL SQL dialect and PL/pgSQL (pgsql) The searched CASE statement follows the rules below: The conditions in the WHEN...
SQL: CASE Statement 1.CASE 写法如下: CASE WHEN condition1 THEN result1 WHEN condition2 THEN result2 WHEN conditionN THEN resultN ELSE result END; 解释:1)先匹配第一条,不匹配的话继续第二条,如此循环,
CASE 语句有两种形式:简单 CASE 语句和搜索型 CASE 语句。 简单CASE 语句 (PL/SQL) 简单CASE 语句尝试将表达式 (称为选择器) 与一个或多个 WHEN 子句中指定的另一个表达式匹配。 发生匹配将导致执行一条或多条相应的语句。 已搜索的 CASE 语句 (PL/SQL) ...
CASE表达式是用来判断条件的,条件成立时返回某个值,条件不成立时返回另一个值。 语法: CASEWHENComparsionConditionTHENresultWHENComparsionConditionTHENresultELSEotherEND (注:各分支返回的数据类型需一致。) (注:when子句一定要有排他性,因为当when子句为真时,剩余的when子句会被忽略。) ...
The case statement in SQL returns a value on a specified condition. We can use a Case statement in select queries along with Where, Order By, and Group By clause. It can be used in the Insert statement as well. In this article, we would explore the CASE statement and its various use...
condition是一个返回布尔类型的表达式,如果表达式为TRUE,则整个函数返回相应result的值;如果表达式皆为 FALSE,则返回 ElSE 后result的值;如果省略了ELSE子句,则返回NULL。 CASE语句只返回第一个符合条件的值,剩下的部分将会被自动忽略。 The CASE statement goes through conditions and returns a value when the firs...