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SQL database field to append to main table

2022-08-10 04:59:00 【CSDN Q&A】

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I have three tables, as follows
form_content1
form_content2
form_content3
The above three tables have UID values
but before the UID of the main table form_contentThere is no this field, so there is no value
Now how do I append the UID values ​​of these three tables to the main table, I have done it before, and now I completely forget
The index field is all ID
Databaseis MySQL 5.6.50

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