How to insert records from table to another without duplicate

Question

I have two tables t1 and t2. t1 has duplicated values. I need to insert all records from t1 to t2, but I don\'t want duplicates to occur in t2. I tried the following command whi

Answer 1

You can create a unique index (of one or more columns) and then use the MySQL replace command.

CREATE UNIQUE INDEX unique_name2 ON t2 (name2);

REPLACE INTO t2 (name2) values ($name1);
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