我做这样说： UPDATE products
SET products_image = (SELECT products_image
FROM products
WHERE products_id = 2)
WHERE products_id = 3;
...但得到一个错误： ERROR 1093 (HY000): You can't s
我需要从表中删除某些行。通过查询发现哪些行必须被删除。然而，it appears that you cannot do both operations (select and delete) in the same query： 目前，你不能从一个 表中删除，并在子查询中从同一个表 选择。 所以我不能做到这一点： DELETE
FROM telefono
WHERE telefono_id I
我需要从mysql中的表中删除重复的记录。 所以我有一个表名“员工”字段EMPID，empname，empssn 为获得重复的记录我写了一个查询 SELECT COUNT(empssn), empssn
FROM employee
GROUP BY empssn
HAVING COUNT(empssn)>1
现在我想删除重复记录。因为我写的查询是。 DELETE FR
SELECT lott.id as lottery_id,lott.abbr,lott.currency,payments.id as payment_id,
payment_prizes.prize_id,prizes.name,prizes.currency as prizes_currency
FROM lotteries lott
JOIN lottery_p
我有两个脚本，一个用于插入，另一个用于更新。 我的更新按钮脚本是采用了最新的插入的标识，并继续是这样的： Update tblsurvey
set WouldLikeToBeSeenOnSite = 'sadffas'
and DislikedOnSite = 'asdfsadfsadf'
and OtherNewsWebsitesRead = 'asdfsadfa'
and LikedO
我与this other question的情况相同，但我不想选择行，我想更新这些行。 我用solution Scott Saunders made： select * from table where email in (
select email from table group by email having count(*) > 1
)
这工作，但我想改变/更新这些条目行的值
我写了这个查询： delete from `test1` where id in (
SELECT id
FROM `test1`
GROUP BY m, n
HAVING count(id) >1)
但MySQL允许这个错误： “你不能指定目标表‘测试1’的更新在FROM子句” 为什么？我该如何解决它？