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可搜索的CASE語句沒有選擇器,語句中的WHEN子句包含給出布爾值的搜索條件。
PL/SQL中可搜索的case語句的語法是 -
CASE
WHEN selector = 'value1' THEN S1;
WHEN selector = 'value2' THEN S2;
WHEN selector = 'value3' THEN S3;
...
ELSE Sn; -- default case
END CASE;
SQL
流程圖
請(qǐng)參考以下示例代碼 -
SET SERVEROUTPUT ON SIZE 1000000;
DECLARE
grade char(1) := 'B';
BEGIN
case
when grade = 'A' then dbms_output.put_line('Excellent');
when grade = 'B' then dbms_output.put_line('Very good');
when grade = 'C' then dbms_output.put_line('Well done');
when grade = 'D' then dbms_output.put_line('You passed');
when grade = 'F' then dbms_output.put_line('Better try again');
else dbms_output.put_line('No such grade');
end case;
END;
/
SQL
當(dāng)上述代碼在SQL提示符下執(zhí)行時(shí),它會(huì)產(chǎn)生以下結(jié)果 -
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