What are the restrictions on adding columns in SQLite

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Restrictions on adding columns to SQLite

To add fields to the SQLite table, you need to be aware of the following issues:

(1) added columns cannot be defined as primary keys.

(2) the added column is date-time type, and CURRENT_TIME, CURRENT_DATE and CURRENT_TIMESTAMP cannot be used as default values.

(3) if the add column is set to NOT NULL, the default value must be set.

(4) if the add column is set as a foreign key, the default value must be set to NULL.

(5) only one column can be added at a time.

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