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我有一個表(tbl)與3個字段:id,日期和狀態。從表樣品信息可能如下:複雜SQLite加入
id date status
1 8-20 open
2 8-20 open
3 8-20 closed
4 8-21 closed
5 8-22 open
6 8-23 open
7 8-24 closed
我想寫如下返回數據的查詢:
date open closed
8-20 2 1
8-21 0 1
8-22 1 0
8-23 1 0
8-24 0 1
我似乎可以得到的是包裝2個聯合在一起選擇在最接近另一種選擇,像這樣:
select date from (
select date, count(id) from tbl where status = 'open' group by date
union
select date, count(id) from tbl where status = 'closed' group by date)
group by date
我認爲這將涉及到全外連接,如果它不是SQLite的,以帳戶爲天,其中一種狀態有0項,但我不知道我竟被如何d構造兩個左連接以獲得期望的結果。
第二個查詢拉數據正確。謝謝! – MLEV 2014-08-29 13:30:56