Understanding MySQL Timestamp Default Values and Zero‑Date Handling

This article explains how MySQL determines default values for TIMESTAMP columns, the effect of the explicit_defaults_for_timestamp parameter, when zero‑date values are permitted via sql_mode, and demonstrates the behavior through four test scenarios with corresponding SQL statements and results.

SQL Modedefault valueexplicit_defaults_for_timestamp

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Understanding MySQL Timestamp Default Values and Zero‑Date Handling

Aikesheng Open Source Community

Nov 3, 2021 · Databases

Why MySQL TIMESTAMP Columns May Fail with “cannot be null” After Migration

The article explains how MySQL's explicit_defaults_for_timestamp setting and strict SQL mode cause TIMESTAMP columns with default CURRENT_TIMESTAMP to produce "Invalid default value" errors during migration from 5.7.28 to 5.7.20, especially when synchronization tools omit NULL and DEFAULT attributes.

explicit_defaults_for_timestampinvalid default valuemigration

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Why MySQL TIMESTAMP Columns May Fail with “cannot be null” After Migration

Aikesheng Open Source Community

Oct 26, 2021 · Databases

Understanding MySQL explicit_defaults_for_timestamp and Its Impact on TIMESTAMP Columns

This article explains how the MySQL system variable explicit_defaults_for_timestamp controls the default and NULL handling of TIMESTAMP columns, demonstrates the differences between OFF and ON settings with practical tests, and discusses why the parameter is being deprecated for stricter time‑data management.

NULLSQLdatabase migration

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Understanding MySQL explicit_defaults_for_timestamp and Its Impact on TIMESTAMP Columns