The CASE statement can be used in the following versions of Oracle/PLSQL: Oracle 12c, Oracle 11g, Oracle 10g, Oracle 9i Example The CASE statement can be used in Oracle/PLSQL. You could use the CASE statement in
In Oracle 9i, you can use thecasestatement within an SQL statement. It has the functionality of an IF-THEN-ELSE statement. 译:在Oracle 9i中,你可以在SQL语句中使用case条件。它具有IF-THEN-ELSE条件的功能。 The syntax for thecasestatement is: 译:语法如下 CASE expression WHEN condition_1 THEN ...
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 statement in detail: 1) selector The selector is an...
The following query uses theCASEexpression in anORDER BYclause to determine the sort order of rows based on column value: SELECT*FROMlocationsWHEREcountry_idIN('US','CA','UK')ORDERBYcountry_id,CASEcountry_idWHEN'US'THENstateELSEcityEND;Code language:SQL (Structured Query Language)(sql) Try ...
The coalesce statement is a bit like the Oracle NVL function. Given an unlimited number of arguments, it will return the first non-null value in those arguments. Here is an example: SELECT ename, COALESCE(comm, 0) COMM FROM emp;
SELECT CASE WHEN age < 18 THEN '未成年' WHEN age >= 18 AND age < 60 THEN '成年' ELSE '老年' END AS age_group, COUNT(*) AS count FROM users GROUP BY age_group 在这个示例中,我们根据用户的年龄来选择不同的年龄段,并统计每个年龄段的用户数量。我们使用CASE语句来实现这个功能,其中包含了...
Oracle decode函数 decode函数在Oracle SQL查询语句中的使用非常广泛,也经常应用到PL/SQL语句块中。...可以作如下理解该表达式: 1,如果expr1 = expr2,decode函数返回expr3表达式的值; 2,如果expr1 !...= expr2,decode函数返回expr4表达式的值,如果expr4未指定,则返回null; 使用示例1: select decode(1,-1,...
如何使用 Oracle Case Statement 测试不等式问题描述 投票:0回答:3这很好用: select case (1+2) -- (or_some_more_complicated_formula_yielding_a_numeric_result) when 200 then '200' when 100 then '100' else 'other' end hi_med_low from dual ; 但我需要做更多这样的事情: select case (1+...
FromOracle Database 23ai, theautomatic SQL transpilercan extract SQL expressions in PL/SQL. These are then part of the SQL statement, so at runtime it's as-if the function doesn't exist! To do this, ensure thesql_transpilerparameter ison(it'soffby default). When a function in thew...
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...