我是MySQL的新手,仍然有其语法问题。我有这个疑问: SELECT a, b, c, d, e
FROM table1
WHERE status = 'skipped'
AND batchid IN (SELECT batchid
FROM (SELECT distinct batchid, date_format(uploaddate, '%Y-%m-%d')
下面的MySQL查询: select `userID` as uID,
(select `siteID` from `users` where `userID` = uID) as `sID`,
from `actions`
where `sID` in (select `siteID` from `sites` where `foo` = "bar")
order by `timesta
我从来没有在MySQL中使用IN的良好性能,并且我再次遇到了性能问题。 我试图创建一个视图。它的相关部分是: SELECT
c.customer_id,
....
IF (c.customer_id IN (
SELECT cn.customer_id FROM customer_notes cn
), 1, 0) AS has_notes
我试图做一个查询这样的: DELETE FROM term_hierarchy AS th
WHERE th.parent = 1015 AND th.tid IN (
SELECT DISTINCT(th1.tid)
FROM term_hierarchy AS th1
INNER JOIN term_hierarchy AS th2 ON (th1.tid = t
我试图执行以下查询 SELECT * FROM person
WHERE id IN
(SELECT user_id FROM participation
WHERE activity_id = '1' AND application_id = '1'
)
外部查询返回,而内部回报29.约4000应答当我的Web服务器没有执行发生了,当
下面的查询返回2036行: SELECT "FooUID" from "Foo" f
LEFT JOIN "Bar" b ON f."BarUID" = b."BarUID"
WHERE f."BarUID" IS NOT NULL AND b."BarUID" IS NULL
但下面的语句仅更新1870行: UPDATE "Foo" f1 set "BarUID" = 'aNewUID'