2015年09月04 - I'm doing a kind of point-of-sale system whose MySQL database has (among other things) a table with items for sale, a table with sales, and a table
2010年06月29 - I have a table with records and it has a row called category. I have inserted too many articles and I want to select only two articles from each
2013年09月18 - tried so far:
到目前为止我尝试了什么:
SELECT id1,
CASE WHEN id2 ='A'
THEN value
ELSE 0
END A,
CASE WHEN id2 ='B'
THEN value
ELSE 0
END B
FROM table1
WHERE id2
2011年01月12 - I'm pretty much looking for a way to filter out rows from a SELECT of one table based on certain values in rows of another table.
我几乎在寻找一种方法来根据另一个表的行
2011年05月12 - the first row could be updated:
我已经找到了一个SELECT查询来查找最近的邮政编码，这是第一行可以更新的一种笨拙的方式：
update table1 set
nearestPostcode1 = (selectquery for returning the first
