Example 5-6, "Simple CASE Statement" Example 5-7, "Searched CASE Statement" Related Topics In this chapter: "IF Statement" In other chapters: "CASE Expressions" "Conditional Selection Statements" "Simple CASE Statement" "Searched CASE Statement" See Also: Oracle Database SQL Language...
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...
simple_case_statement.gifの説明searched_case_statement ::=searched_case_statement.gifの説明(statement ::=、boolean_expression ::=)キーワードとパラメータの説明case_operand複数の選択肢から1つ選択するために値が使用される式。 式の値は、BLOB、BFILE、オブジェクト型、PL/SQLレコード、索引付き...
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...
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;
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...
SQL CASE Statement 常见问题及解决方法 问题1:CASE语句在某些数据库中不支持 原因:不同的数据库系统对CASE语句的支持程度可能有所不同。 解决方法: 确保你使用的数据库系统支持CASE语句。 查阅相关数据库系统的文档,了解其特定的语法和限制。 问题2:CASE语句导致查询性能下降 ...
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 thewhere...
Simple PL/SQL CASE statement A simpleCASEstatement evaluates a single expression and compares the result with some values. The simpleCASEstatement has the following structure: CASEselectorWHENselector_value_1THENstatements_1WHENselector_value_1THENstatement_2 ...ELSEelse_statementsENDCASE;Code language...
when expression 1 then pl/sql_statement1; when expression 2then pl/sql_statement2; …… when expression Nthen pl/sql_statement n; [else pl/sql_statement n+1;] end; 虽然CASE语句的作用与IF..ELSIF..ELSE..END IF语句相同,都可以实现多项选择,但是CASE语句可以以一种更简洁的表示法实现该功能。