Oracle - 获取星期几

今天是星期二。

为什么当我运行这个 SQL 语句时，它说今天不是星期二？

SELECT 
CASE 
WHEN TO_CHAR(sysdate, 'Day') = 'Tuesday' THEN 'Its Tuesday'
ELSE 'Its Not Tuesday'  
END AS case_result,
TO_CHAR(sysdate, 'Day') AS day
FROM DUAL

Returns:

CASE_RESULT DAY
It's Not Tuesday    Tuesday

尝试这样，

SELECT CASE 
       WHEN trim(TO_CHAR(SYSDATE, 'Day')) = 'Tuesday' THEN 'Its Tuesday'
       ELSE 'Its Not Tuesday'  
       END AS case_result,
       TO_CHAR(SYSDATE, 'Day') AS DAY
FROM  DUAL;

或者按照 ajmalmhd04 的建议，您可以尝试FmDay like,

SELECT CASE 
       WHEN TO_CHAR(SYSDATE, 'FmDay') = 'Tuesday' THEN 'Its Tuesday'
       ELSE 'Its Not Tuesday'  
       END AS case_result,
       TO_CHAR(SYSDATE, 'Day') AS DAY
FROM  DUAL;