I need to move the values in the column name
options_2
into the column name
options_1
But only on the condition when options_1 is empty . (Point A in the image.) If options_1 is not empty ( Point B in the image ), then nothing should happen as I do not want to overwrite the existing values.
Additionally, I would like to then clear our options_2. But this time the rule should be to only clear our options_2 if it is the exact duplicate of options_1. This would make sure that it won't delete all the option_2 values, which are valid ones further down in the database.
The structure is as follows:
database_name >> wp_cart66_products
I researched and found the command:
update 'wp_cart66_products' set 'options_1' = 'options_2'
But this has no conditional rules, and would transfer and overwrite valid values as well, which I do not want.
update wp_cart66_products
set options_1 = options_2,
options_2 = ''
where options_1 IS NULL or options_1 = ''
This should do what you need. Note that is goes ahead and clears options_2
when copying the data over, as in this case options 1 & 2 would have been equal if option 2 remained unchanged.
UPDATE `wp_cart66_products`
SET
`options_1` = `options_2`,
`options_2` = ''
WHERE
`options_1` = ''
OR `options_1` IS NULL
This takes care of all your cases in Block A of your picture, but would not touch those items in Block B. This sounds like what you wanted.
You could then run a second query like this to take care of the cases where option_1 and option_2 match from the start, and you want to clear options_2.
UPDATE `wp_cart66_products`
SET `options_2` = ''
WHERE `options_1` = `options_2`
After your run these two queries you will only have two different cases for your field tuple:
options_1
is non-zero-length string and options_2
is empty string options_1
and options_2
are non-matching strings of non-zero length.
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