MySQL Table Difference: Compare Two Tables

2 years ago
Noah Thompson
1 minute

To calculate the difference between two tables, you can use either NOT IN or LEFT JOIN. Here is a specific example:

  1. outside of
SELECT column1, column2
FROM table1
WHERE column1 NOT IN (SELECT column1 FROM table2);
  1. Combining tables based on a common key specified in the left table.
SELECT table1.column1, table1.column2
FROM table1
LEFT JOIN table2 ON table1.column1 = table2.column1
WHERE table2.column1 IS NULL;

Both methods can calculate the difference set of the two tables. You can choose the appropriate method based on the specific situation to calculate the difference set.

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