cast as the declared type of the <case specification>.b) If no <search condition> in a <case...
在Oracle数据库中,'CASE WHEN'语法用于根据条件执行不同的操作或返回不同的值。它类似于其他编程语言中的条件语句,可以帮助我们在查询或更新数据时进行灵活的处理。 'CASE WHEN'语法的基本结构如下: 代码语言:txt 复制 CASE WHEN condition1 THEN result1 WHEN condition2 THEN result2 ... ELSE resultN END 其...
The CASE WHEN expression is used to implement conditional logic in SQL queries. It evaluates conditions and returns specific results based on whether the condition is true or false. It's commonly used in SELECT statements, but can also be used in WHERE, ORDER BY, and other SQL clauses. Syn...
语法说明: 方式一: CASE value WHEN [compare_value] THEN result [WHEN [compare_value] THEN result …] [ELSE result...] END 方式二: CASE WHEN [condition] THEN result [WHEN [condition] THEN result …] [ELSE result] END...使用演示样例: mysql> select id,name, (gender) as ‘性别’ from...
2) Case:a) If the value of the <search condition> of some <searched when clause> in a <...
A week this year Against a week this time last year in SQL (NOT MDX) A WITH keyword and parenthesis are now required Accent Sensitivity Access Code - DELETE Statement with DISTINCTROW and T-SQL Access Now() vs. T-SQL GETDATE() ? ADD and SUBTRACT depending on the condition is CASE STAT...
例句：1.表地点: the stage where the girls are going to dance is in the gym.2.表时期: the stage when he is preparing for his study is really important.不同的叙述：①当先行词为case，condition，situation，position，point，stage等名词，表示情况、方面、处境时用关系副词where.②当先行...
I have done this in the past and has worked for me. WHERE (CASE WHEN conditiontomeet=met THEN ControlNum ELSE 0 END) = (CASE WHEN conditiontomeet=met THEN '555' ELSE 0 END) AND (CASE WHEN otherconditiontomeet=met THEN Deparment ELSE 0 END) = (CASE WHEN otherconditiontomeet=met ...
searched-when-clause: WHENsearch-conditionTHEN結果式NULL simple-when-clause: 式WHEN式THEN結果式NULL 一般に、case 式 の値は、真と評価される最初 (左端) の when 文節 の後ろにある result-expression の値です。 どの CASE の評価も真にならず、ELSE キーワードが存在する場合は、結果は result-ex...
CASE WHEN condition_1 THEN commands WHEN condition_2 THEN commands ... ELSE commands END CASE; MySQL evaluates each condition in the WHEN clause until it finds a condition whose value is TRUE, then corresponding commands in the THEN clause will execute. If no condition is TRUE , the command...