嗨,大家好我有我的代码在这里我是如何做嵌套选择,现在我的问题是我想删除我的嵌套选择一些文件,但我不知道如何..MySQL的 - 如何从嵌套选择删除
SELECT title,
filename,
jono,
client,
dt,
remarks
FROM ((SELECT doc_title AS title,
doc_filename AS filename,
doc_jono AS jono,
doc_client AS client,
doc_date AS dt,
remarks
FROM tbl_doc)
UNION
(SELECT wbok_title AS title,
wbok_filename AS filename,
wbok_jono AS jono,
wbok_client AS client,
wbok_date AS dt,
wbok_remarks AS remarks
FROM tbl_wbok)
UNION
(SELECT cad_title AS title,
cad_filename AS filename,
cad_jono AS jono,
cad_client AS client,
cad_date AS dt,
cad_remarks AS remarks
FROM tbl_cad)
UNION
(SELECT oth_title AS title,
oth_filename AS filename,
oth_jono AS jono,
oth_client AS client,
oth_date AS dt,
oth_remarks AS remarks
FROM tbl_oth)) AS t1
ORDER BY title
我怎么能创建一个类别? – Andrew 2012-08-15 17:36:28
向表中添加一个新字段。把它命名为“类别”。 – 2012-08-15 17:55:48