How Can I Efficiently Retrieve Emails from MySQL Tables with Comma-Separated Values?

Retrieve Emails from Tables with Comma-Separated Values in MySQL

Querying database tables with comma-separated values can present challenges. Consider the scenario where you have two tables: customers containing customer emails and imap_emails with the to field holding comma-separated email addresses. To fetch emails and search against the to and from fields, a traditional LIKE condition may not suffice.

A more efficient solution is to employ the FIND_IN_SET function. This function evaluates whether a specific value is present within a comma-separated string, allowing you to narrow down search results effectively. Here's a modified version of your query using FIND_IN_SET:

SELECT *
FROM imap_emails
INNER JOIN customers
ON FIND_IN_SET(customers.email, imap_emails.to) > 0

Note that this query retrieves emails where the customer's email address appears in the to field of imap_emails. Depending on your requirements, you can modify the query to refine the search criteria further.

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