I'm not sure if I need to write a PHP for-loop to do this, or if it can all be
done in one SQL statement?
Basically, I want to copy all the barcodes from one table and put them into
another table, but only if the barcode in the first table > 0, and only if the
wineid's match from table to table.
Steps individually are something like this:
1) First, I get all the records from the "wine" table that have barcodes, like
this:
SELECT * FROM `wine` WHERE barcode2 > 0
The fields I need are "barcode2", and "wineid"
2) Next, I need to match all the wineid's from this "wine" table with the wine
id's from the "usersdata" table. Both fields in both tables are called
"wineid".
3) Then, if the wineid's match, I need to copy the "barcode2" value from the
wine table and put it into the field "custombarcode" in the "usersdata" table.
I'm tempted to write a PHP script which does a while-loop through all the
records returned from the wine table and do the matching with the usersdata
table, but I wouldn't be surprised if there's some sort of table-join-type
query that can do all this in one step.
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