[英]Retrieving data from two different tables with common column using left outer join and on clause
伙計們,我有兩個不同的桌子。
表格1:
contract-id | contract-date
1 | 01-05-2016
1 | 01-06-2016
1 | 01-07-2016
2 | 01-01-2016
2 | 01-02-2016
3 | 01-05-2016
3 | 01-06-2016
表2:
invoice-number|contract-id|invoice-from-date|invoice-to-date
1 |1 |01-05-2016 |31-05-2016
2 |1 |15-05-2016 |31-05-2016
3 |1 |25-05-2016 |31-05-2016
我的要求是,我必須顯示表1中本月產生的所有合同,並且必須顯示表2中為這些合同籌集的發票數。 如果有任何發票,則應顯示其計數或僅顯示零。 預期的答案是:
contract-id|counts
1 |3
3 |0
合同編號:1的計數為3,因為我當月已開了3張發票,合同編號:3的計數為0,因為我沒有為此開任何發票。 而且缺少contract-id:2,因為它不在當前月份之內。
這是我嘗試過的:
select cbm_contract_period_value_split.contract_id,
count(cbm_contract_invoice_request.contract_id),
cbm_contract_period_value_split.contract_date
from cbm_contract_period_value_split
left outer join cbm_contract_invoice_request
on cbm_contract_period_value_split.contract_id = cbm_contract_invoice_request.contract_id
and MONTH(cbm_contract_period_value_split.contract_date) = MONTH(CURDATE())
and MONTH(cbm_contract_invoice_request.invoice_for_the_period_of_from_date) = MONTH(CURDATE())
我已經發布了這個問題,但是現在我將其發布為帶有我得到的答案的編輯版本。 但是,我沒有得到想要的答案。 怎么了,我該怎么辦?
試試這個。 我認為您需要一個GROUP BY,並且我將WHERE放在其中以過濾出不是當前月份的行。
select pvs.contract_id,
count(ir.contract_id) as counts,
pvs.contract_date
from cbm_contract_period_value_split as pvs
left join cbm_contract_invoice_request as ir
on pvs.contract_id = ir.contract_id
and MONTH(ir.invoice_for_the_period_of_from_date) = MONTH(CURDATE())
WHERE MONTH(pvs.contract_date) = MONTH(CURDATE())
GROUP BY pvs.contract_id,pvs.contract_date
http://sqlfiddle.com/#!9/e5f08c/9
結果
contract_id counts contract_date
1 3 May, 01 2016 00:00:00
3 0 May, 01 2016 00:00:00
SELECT Table-1.contract_id, Table-1.contract-date, COUNT(*) AS count FROM Table-2 LEFT JOIN Table-1 ON Table-1.contract_id = Table-2.contract_id WHERE MONTH(Table-1.contract-date) = MONTH(CURDATE()) GROUP BY Table-1.contract_id
試試這個查詢..
SELECT
t1.`contract-id`,
(
CASE
WHEN t2.`contract-id` IS NULL
THEN 0
ELSE COUNT(*)
END
) AS counts
FROM
t1
LEFT JOIN t2
ON t1.`contract-id` = t2.`contract-id`
WHERE MONTH(`contract-date`) = MONTH(CURDATE())
GROUP BY t2.`contract-id`
ORDER BY t1.`contract-id`,`contract-date` ;
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