I want to compare the values of specified columns from two tables and output the difference. For example, table A and table A1 share the same column “val1“ but have different column values, how to output their differences in DolphinDB?
How to compare the values of specified columns from two tables in DolphinDB?
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Do a
FULL OUTER JOIN. Return only the rows where either a.val1 doesn't exist, or a1.val1 doesn't exist.You can also do
select a.val1, a1.val1 ..., if you want do know which table each value comes from.