[英]Query to update 1 column with no condition and another column only if certain condition is met
我有以下SQL Server查詢來更新tblTicket中的列類型:
UPDATE A set type=B.type
FROM tblTicket A
JOIN (select b.tblTicket_id,a.type
from tblP a
JOIN tblA b ON a.allocation_id = b.id
WHERE b.tblTicket_id =@tblTicket_id Group By b.tblTicket_id,a.type) B
ON A.id=b.tblTicket_id
我也想更新表tblTicket中的列出價,但前提是a.name =“ ML”:
UPDATE A set bid = B.id
FROM tblTicket A
JOIN (select b.tblTicket_id,f.id
FROM tblP a
JOIN tblA b ON a.allocation_id = b.id
JOIN FIRM f ON f.firm = a.firm
WHERE b.tblTicket_id =@tblTicket_id and a.name = 'ML' Group By b.tblTicket_id,f.id) B
ON A.id=b.tblTicket_id
我可以結合上面的第一查詢和第二查詢嗎? 謝謝。
如果滿足特定條件,則可以使用CASE
更新列,否則可以使用相同的值“設置”該列。
“最佳實踐”技巧:在嵌套查詢中避免使用相同的別名(即使從大寫切換為小寫,反之亦然)。
UPDATE A set type=B.type,
bid = case when a.name = 'ML' then B.id else bid end
FROM tblTicket A
JOIN (select b.tblTicket_id,a.type
from tblP a
JOIN tblA b ON a.allocation_id = b.id
WHERE b.tblTicket_id =@tblTicket_id Group By b.tblTicket_id,a.type) B
ON A.id=b.tblTicket_id
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