This source code sets the SQL String in Query1. As it fits on one line we just use SQL[0].
The SQL statement finds all the fields from the Article table where the user_id field is equal to a varaible Text value dbtUser.Text.
A better way would be to use Parameters in the Query.
Query1.SQL[0] := 'select * from article where user_id = ' + dbtUser.Text + '';
Query1.Active := True;
Query1.Active := True;
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