How to Resolve the 'Cannot Add or Update Child Row: a Foreign Key Constraint Fails' Error?

Foreign Key Violation: "Cannot Add or Update Child Row" Error Resolved

Many programmers encounter the perplexing "Cannot add or update a child row: a foreign key constraint fails" error when working with relational databases. This error indicates a discrepancy between the values in two or more related tables.

In this specific case, the error arises in relation to two tables, table #1 and table #2. Table #1 contains user information, including fields for UserID, Password, Username, and Email. Table #2 holds post information, with fields for UserID, PostID,

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