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Moving column values from one table to another

I have two tables wherein I have to get a string of values from one column of one table and pump the retrieved information into a new column in the other table. How do I do this?

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If you just need to insert the data from one table into another, then you can use the INSERT..SELECT command similar to the following:
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);

This was first published in August 2006

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