The UPDATE statement allows you to update a single record or multiple records in a table, in this case below you want to update with the same table where you want the first stat found will update
Here’s the SQL Query
update table_cust set Stock = 0, stat=2 where Code_data = (select TOP 1 (code_data) from tb_cust where stat = 1 order by date_in).
http://www.gokhiel.com/2012/07/update-where-select-affecting-only.html

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