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INSERT INTO new_table (columnA) SELECT columnB FROM old_table;If you need to update a column in one table based on the values in another, then you will need to figure out which column maps rows from one table to the other. In my example below, I'll call this column the key_column. The UPDATE command can look like the following:
UPDATE new_table SET columnA = (SELECT columnB FROM old_table WHERE old_table.key_column = new_table.key_column);
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