Question

我有两个表，Expense和EditedExpense。我有这两个表，因为当您想要在Expense中编辑帖子时，它会在EditedExpense中创建一个新帖子。所以你总是在费用表中有原始帖子。您只能更改原始帖子（费用表）。如果更改Expnese三次，您将找到三个具有相同ExpenseId的EditedExpense（不同的列值和DateCreated）。现在我想选择所有重新开支。 Resent exepense我的意思是如果Expense有一个或几个EditedExpnes，你选择最近的EditedExpense，否则选择原始Expense。 Espense表：

ExpenseId, DateCreated, .... ReceiptFilePath

和EditedExpense表：

EditedExpenseId, ExpenseId, DateCreated, .... ReceiptFilePath

Answer 1

试试这个：

SELECT e.ExpenseId, e.DateCreated, e....., e.ReceiptFilePath,
    X.EditedExpenseId AS EditedExpenseId_, X.ExpenseId AS ExpenseId_, X.DateCreated AS DateCreated_, 
    X..... AS .....,  X.ReceiptFilePath AS ReceiptFilePath_
FROM Espense AS e
    OUTER APPLY
    (SELECT TOP 1 ee.EditedExpenseId, ee.ExpenseId, ee.DateCreated, ee.....,  ee.ReceiptFilePath
        FROM EditedExpense AS ee
        WHERE ee.ExpenseId = e.ExpenseId
        ORDER BY ee.DateCreated DESC, ee.EditedExpenseId DESC) AS X

选择两个不同表中的最近帖子（SQL）

1 个答案: