The Oracle/PLSQL CASE statement has the functionality of an IF-THEN-ELSE statement. Starting in Oracle 9i, you can use the CASE statement within a SQL statement. Syntax The syntax for the CASE statement in Oracle/PLSQL is: CASE [ expression ] WHEN condition_1 THEN result_1 WHEN condition...
搜索式CASE语句有个能够产生boolean(true,false,null)的搜索条件,当特定搜索条件计算结果为TRUE时,会执行与该条件相关的语句组合。搜索式CASE语句的语法如下所示: CASE WHEN SEARCH CONDIDTION 1 THEN STATEMENT 1; WHEN SEARCH CONDIDTION2 THEN STATEMENT 2; ... WHEN SEARCH CONDIDTIONN THEN STATEMENT N; EL...
Simple PL/SQL CASE statement A simple CASE statement evaluates a single expression and compares the result with some values. 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_state...
ORACLE PLSQL 简单case语句 1 简单的case语句会给出一个表达式，并将可能发生的结果与其做比较，如果匹配成功则执行对应的语句 2 语法：[ <<lable_name>> ]CASE case_operandWHEN when_operand1 THEN statement1;[WHEN when_operand2 THENstatement1;] ...[ELSEstatementN]END CASE [ lable_name ];3 说明...
/SQL是 Procedure Language & Structured Query Language 的缩写。ORACLE的SQL是支持ANSI(American national Standards Institute)和ISO92 (International Standards Organization)标准的产品。PL/SQL是对SQL语言存储过程语言的扩展。从ORACLE6以后,ORACLE的RDBMS附带了PL/SQL。它现在已经成为一种过程处理语言,简称PL/SQL。
--SQL语句 --PL/SQL语句 EXCEPTION –可选 --异常处理部分 END; --必须 即由声明,执行,异常组成 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. DEMO: DECLARE V_value1 VARCHAE2(5); BEGIN SELECT cn_name INTO v_value1 FROM table_name;
11、 THEN STATEMENT1; WHEN EXPRESSION2 THEN STATEMENT2; WHEN EXPRESSIONn THEN STATEMENTn; ELSE STATEMENTm; END CASE; 2、循环语句 为了重复执行一条语句或者一组语句,可以使用循环语句。循环语句分基本循环,WHILE循环和FOR循环三种类型。 基本循环语法如下: LOOP STATEMENT; EXIT WHEN CONDITION; END LOOP ;...
This Oracle tutorial explains how to use the Oracle SELECT statement with syntax, examples, and practice exercises. The Oracle SELECT statement is used to retrieve records from one or more tables in an Oracle database.
1、PLSQL工具 PL/SQL Developer的简介:PL/SQL Developer是一种专门用于开发、测试、调试和优化Oracle PL/SQL的一种工具,更是一个非常好用的Oracle的管理工具。 官网下载地址:https://www.allroundautomations.com/bodyplsqldevreg.html(像普通软件安装即可) ...
SQL> EXEC get_my_results; PL/SQL procedure successfully completed. ResultSet #1 COUNT(*) --- 3 1 row selected. SQL> 通过RETURN_RESULT过程返回DBMS_SQL的游标时也会存在一些限制和不足。 3. GET_NEXT_RESULT 一般来说,我们希望通过客户端应用来处理这些结果集,这可以通过DBMS_SQL包的 GET_NEXT_RESUL...