Integrity constraint violation: 1052 Column ‘user_id’ in where clause is ambiguous

Why can’t you stop buying 618?From the technical dimension to explore>>>

When SQL associated query, user_ If Id appears in multiple tables with the same name, it cannot be used directly as “user”_ id> 100 “and other similar operations

The user must be prefixed with the associated form_ ID, such as “apply, user”_ id > 100”。

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