2)如果都没匹配,而且没有ELSE语句就返回NULL值。 2.举例: SELECTOrderID, Quantity,CASEWHENQuantity>30THEN'The quantity is greater than 30'WHENQuantity=30THEN'The quantity is 30'ELSE'The quantity is under 30'ENDASQuantityTextFROMOrderDetails; SELECTCustomerName, City, CountryFROMCustomersORDERBY(CASE...
Here, theCASEstatement checks if theamountis greater than or equal to400. If this condition is satisfied, a new columnoffer_pricewill contain the values equal toamount - amount * 10/100. CASE With Multiple Conditions It is also possible to stack multiple conditions inside a singleCASEclause. ...
1Examples:2MariaDB> SELECT CASE 1 WHEN 1 THEN 'one'3-> WHEN 2 THEN 'two' ELSE 'more'END;4-> 'one'5MariaDB> SELECT CASE WHEN 1>0 THEN 'true' ELSE 'false'END;6-> 'true'7MariaDB> SELECT CASE BINARY 'B'8-> WHEN 'a' THEN 1 WHEN 'b' THEN 2END;9-> NULL 1MariaDB [tes...
sql case statement
SQL IF-ELSE and WHILE examples SQL CASE statement examples How to create a Windows Service in the Component Designer New Windows Phone 7 toolkit by Coding4Fun SQL GROUP BY and HAVING clauses SQL Select Where Interview Questions jQuery Selectors reviewed jQuery fadeIn, fadeOut and...
Examples: Azure Synapse Analytics and Analytics Platform System (PDW) G. Use a SELECT statement with a CASE expression Within a SELECT statement, theCASEexpression allows for values to be replaced in the result set based on comparison values. The following example uses theCASEexpression to change...
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 ...
CASE 语句在指定的搜索条件为 true 时执行一条或多条语句。 CASE 是独立的语句,它与必须作为表达式组成部分出现的 CASE 表达式不同。 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...
While NULL can be returned from multiple result expressions, not all of these can explicitly be the NULL constant. If all result expressions use the NULL constant, error 8133 is returned. Examples A. Use a SELECT statement with a simple CASE expression Within a SELECT statement, a simple ...
Query hints can't be specified in an INSERT statement, except when a SELECT clause is used inside the statement. Query hints can be specified only in the top-level query, not in subqueries. When a table hint is specified as a query hint, the hint can be specified in the top-level que...