The SQL CASE Expression TheCASEexpression goes through conditions and returns a value when the first condition is met (like an if-then-else statement). So, once a condition is true, it will stop reading and ret
ELSE else_statements END CASE; Code language: PostgreSQL SQL dialect and PL/pgSQL (pgsql) Let’s examine the syntax of the simple CASE statement in detail: 1) selector The selector is an expression that is evaluated once. The result of the selector is used to select one of the ...
简单Case语句:简单Case语句通过比较一个表达式与一系列可能的值,然后根据匹配的值执行相应的操作。示例代码如下: 在这个例子中,根据expression的值,Case语句会选择匹配的value并返回相应的result。如果没有匹配的值,将返回ELSE语句中的result。 搜索Case语句:搜索Case语句通过逐个检查一系列条件来执行操作。当条件满足时,...
Mysql中的条件语句if、case Mysql中的条件语句在我们对数据进行转换的时候比较有用,这样就不需要创建中转表。...= "" IF ELSE 流程控制语句 在mysql存储过程中的用法: IF search_condition THEN statement_list [ELSEIF search_condition...[ELSE statement_list] END IF IF作为一条语句,在END IF后需要加上分...
NOTE: SQL commands are not case sensitive. The above SELECT statement can also be written as"select first_name from students_details;" You can also retrieve data from more than one column. For example, to select first name and last name of all the students. ...
Using a SELECT statement with a searched CASE expression Within a SELECT statement, the searched CASE expression allows for values to be replaced in the result set based on comparison values. The following example displays the list price as a text comment based on the price range for a product...
statement:语句,一条SQL clause:子句,一条SQL里的部分,比如上面的SELECT xxx,JOIN xxx,HAVING xxx等都是。一条statement由若干条clause按一定顺序组成(语法规则)。 experession:表达式,clause中的一部分,比如 WHERE id>1 里的 id>1 是个expression 一些不常见的SQL语句: ...
CASE expression syntax is similar to an IF-THEN-ELSE statement. Oracle checks each condition starting from the first condition (left to right). When a particular condition is satisfied (WHEN part) the expression returns the tagged value (THEN part). If none of the conditions are matched, the...
For Male employee, salary is appearing in ascending order. 男性员工,薪资按升序排列。 这里用到了另一种CASE的用法: CASE Gender WHEN 'F' THEN Salary END 等同于 CASE WHEN Gender = 'F' THEN Salary 语法为: CASE Expression WHEN expression1 THEN Result1 [WHEN expression2 THEN Result2] ... [...
The searchedCASEexpression evaluates a set of Boolean expressions to determine the result. Both formats support an optional ELSE argument. CASEcan be used in any statement or clause that allows a valid expression. For example, you can useCASEin statements such as SELECT, UPDATE, DELETE and SET...