摘要:
1:Oracle select text from all_views where view_name = '视图名字'; 2:SQL select text from syscomments s1 join sysobjects s2 on s1.id=s2.id where name='视图名字 阅读全文
摘要:
尽量避免在 where 子句中使用 or 来连接条件,否则将导致引擎放弃使用索引而进行全表扫描,如: select id from t where num=10 or num=20 可以这样查询: select id from t where num=10 union all select id f 阅读全文
摘要:
--创建临时表SELECT (select count(*) from ssss_ccbs_ac_water_meter cm where cm.ssss_sso_case_no=c.ssss_codcaseId)ssss_no_of_ccbs_ac, c.ssss_codcaseIdinto ss 阅读全文