Shulou(Shulou.com)05/31 Report--

This article mainly shows you "what are the restrictions on adding columns in SQLite", the content is simple and clear, and I hope it can help you solve your doubts. Let the editor lead you to study and learn about "what are the restrictions on adding columns in SQLite".

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.

The above is all the content of the article "what are the restrictions on adding columns in SQLite". Thank you for reading! I believe we all have a certain understanding, hope to share the content to help you, if you want to learn more knowledge, welcome to follow the industry information channel!

Welcome to subscribe "Shulou Technology Information " to get latest news, interesting things and hot topics in the IT industry, and controls the hottest and latest Internet news, technology news and IT industry trends.