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This article introduces the relevant knowledge of "how to insert record line numbers into existing tables by mysql". In the operation of actual cases, many people will encounter such a dilemma, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

Insert a record line number into an existing table

1. First add a column to the existing table and use this column to store the row number

two。 Insert the record line number into this new field in the table

Such as:

SET @ mycnt = 0

UPDATE datamanagement

SET rownum= (@ mycnt: = @ mycnt + 1)

WHERE industryid='38'

ORDER BY dataid

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