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Renaming a column mid-deploy breaks old servers and queue workers. Use expand/contract, batched backfills and the right deploy order to change schemas safely.
OFFSET makes deep pages slow and shuffles rows when data changes. Learn keyset queries, composite cursors, Laravel cursorPaginate and cursor-based API design.
See why a query without an index scans every row, how an index turns it into a fast lookup, and how to read EXPLAIN to tell the difference.
Learn essential techniques to protect your PHP applications from SQL injection attacks.
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