在SQL UNION查询添加列内容
题
到目前为止,我有这个疑问。
SELECT
COUNT(f.code_id) as item_count,
f.code_desc
FROM
foo f
INNER JOIN foohistory fh ON f.history_id = fh.history_id
WHERE
MONTH(fh.create_dt) = 6
AND YEAR(fh.create_dr) = 2010
GROUP BY
f.code_desc
UNION ALL
SELECT
COUNT(b.code_id) as item_count,
b.code_desc
FROM
bar b
INNER JOIN barhistory bh ON b.history_id = bh.history_id
WHERE
MONTH(bh.create_dt) = 6
AND YEAR(bh.create_dr) = 2010
GROUP BY
b.code_desc
我的目标是UNION这两个查询添加SUM的“ITEM_COUNT”列的foreach code_desc。这是可能的?
解决方案
如果没有有关代码的更多信息,一样,如果它是可能的,码是两个表之间相互排斥,使用:
SELECT x.code_desc,
SUM(x.item_count)
FROM (SELECT f.code_desc,
COUNT(f.code_id) as item_count
FROM foo f
JOIN foohistory fh ON f.history_id = fh.history_id
WHERE MONTH(fh.create_dt) = 6
AND YEAR(fh.create_dr) = 2010
GROUP BY f.code_desc
UNION ALL
SELECT b.code_desc,
COUNT(b.code_id) as item_count
FROM bar b
JOIN barhistory bh ON b.history_id = bh.history_id
WHERE MONTH(bh.create_dt) = 6
AND YEAR(bh.create_dr) = 2010
GROUP BY b.code_desc) x
GROUP BY x.code_desc
其他提示
对,做这样的
SELECT Sum(unionedTable.item_count)
FROM
(
//your query
) as unionedTable
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