WHEN SEARCH CONDIDTION 1 THEN STATEMENT 1; WHEN SEARCH CONDIDTION2 THEN STATEMENT 2; ... WHEN SEARCH CONDIDTIONN THEN STATEMENT N; ELSE STATEMENT N+1; END CASE; 当搜索条件的计算结果为TRUE时,执行控制权传递与之相关的语句。如果任何搜索条件都不会产生TRUE,则会执行与ELSE子句相关的语句。请注意...
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...
In this example, if the deptno column has a 10 in it, the SQL query will return the value accounting rather than the number 10. If the deptno is not 10, 20, 30, or 40, then the CASE statement will fall through to the ELSE clause, which will return unassigned. Note that with a s...
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...
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...
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 ...
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。
ORA-00905是Oracle数据库中的一个错误代码,表示SQL语句中缺少了关键字。要修复这个错误,可以使用case表达式来添加缺少的关键字。 case表达式是一种条件表达式,它可以根据条件的结果...
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,-1,100,90),decode(-...
oracle.javatools.db.sql Contains an API for declaratively parsing SQL queries (SELECT statements). Uses ofCaseStatement.WhenTheninoracle.javatools.db.sql Methods inoracle.javatools.db.sqlthat returnCaseStatement.WhenThen Modifier and TypeMethod and Description ...