sql

PDO with INSERT INTO through prepared statements

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You should be using it like so Prepared statements are used to sanitize your input, and to do that you can use :foo without any single quotes within the SQL to bind variables, and then in the execute() function you pass in an associative array of the variables you defined in the SQL statement. You may also use ? instead of :foo and then pass in … Read more

SQL join on multiple columns in same tables

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I have 2 subqueries, but I’m having trouble joining columns together from the same tables. I tried: If I simply end the query with ON a.userid = b.sourceid it works, but how can I also join these tables on another column also ON a.listid = b.destinationid ?? Any help appreciated.

MySQL syntax for Join Update

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MySQL supports a multi-table UPDATE syntax, which would look approximately like this: You can update the Train table and delete from the Reservations table in the same transaction. As long as you do the update first and then do the delete second, it should work.

The multi-part identifier could not be bound

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You are mixing implicit joins with explicit joins. That is allowed, but you need to be aware of how to do that properly. The thing is, explicit joins (the ones that are implemented using the JOIN keyword) take precedence over implicit ones (the ‘comma’ joins, where the join condition is specified in the WHERE clause). Here’s an outline of … Read more