我有一个动态查询,它可以识别成员尚未租用的CD。我使用的是NOT IN子查询,但当我有大的成员表时,它会使它们变得非常慢。如何优化查询有什么建议吗?
SELECT DVDTitle AS "DVD Title"
FROM DVD
WHERE DVDId NOT IN
(SELECT DISTINCT DVDId FROM Rental WHERE MemberId = AL240);
谢谢
我有以下表达式:[^(\r\n)]*来识别任何不包含\r\n的文本。但是,当文本包含(或)时,则无法识别。
示例:
"I have following expression to recognize any text."将被确认为OK。
"I have following expression (A) to recognize any text."将不被识别。
因此,我想要全文:"I have following expression (A) to recognize any text."