SQL Query to find the previous row

Mansoor Mohammed 61 Reputation points


I want to update the transaction colum in the table that has previous transaction(TansactionSequence minus one) from Y to E.
Ex:Update Transaction colum 5 and 10 to E
Note: 1. TansactionSequence with 1 is always Y, and can have multiple Transaction Sequence numbers.
2. SequenceNo is a primary Key

SQL Server
SQL Server
A family of Microsoft relational database management and analysis systems for e-commerce, line-of-business, and data warehousing solutions.
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  1. Viorel 109.8K Reputation points

    It seems that you did not give all of details. Try this statement:

    update T
    set Transactions = 'E'
        select *, lag(Transactions) over (partition by CreditCardNumber order by TransactionSequence) as pt 
        from MyTable
    ) T
    where pt = 'E'
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