How to add a value to the current in each row of a mysql table?

Question

How to add a value to the current in each row of a mysql table?

Asked 7 years ago

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I have the following table in a mysql database:

I would like a command to run in phpmyadmin, which sums the current value of the rating_sum column with 5, and rating_count with 1, thus leaving:

I want to add these values (5 , 1) to all rows of the table, without any restriction. I tried some things I found here in the OS, but they were examples to display the total value of a certain column, and it’s not what I need.

How could I?

SELECT *, ( rating_sum + 5 ), ( rating_count + 1 ) FROM TABELA

– MarceloBoni

2017/06/16 at 02:51
@Marceloboni hello, the command you passed, only creates two new columns with the added values, but does not change the values already present in the table, I tried to adapt to UPDATE DATABASE.TABLE SET `, ( rating_sum + 5 ), ( rating_count + 1 ); but gives a syntax error.

– Wesley

2017/06/16 at 03:00
A ta, I get it, UPDATE BANCO.TABELA SET rating_sum = ( rating_sum + 5 ), rating_count = ( rating_count + 1 );

– MarceloBoni

2017/06/16 at 03:04
@Marceloboni thank you very much, it worked exactly as you would like, can add as reply to mark as resolved please?

– Wesley

2017/06/16 at 03:07

1 answer

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by MarceloBoni • **6,385** points · Answer 1 · 2017-06-16T03:12:27+00:00

When you want to do a sum update (among other operations) of a column in all rows of a table, just reference the column itself in the update without defining a where (this will cause all rows in the table to be updated). In each row will be used the value already filled in the fields.

In your case, something like that:

UPDATE BANCO.TABELA SET rating_sum = ( rating_sum + 5 ), rating_count = ( rating_count + 1 );