There are several ways you can compare two Hive tables to determine the differences between them. Here are a few options:
- Use the
EXCEPT
operator: You can use theEXCEPT
operator to compare the rows in two tables and return only the rows that are present in the first table but not in the second. For example:
SELECT * FROM table1
EXCEPT
SELECT * FROM table2;
- Use the
MINUS
operator: You can use theMINUS
operator, which is equivalent to theEXCEPT
operator, to compare the rows in two tables and return only the rows that are present in the first table but not in the second. For example:
SELECT * FROM table1
MINUS
SELECT * FROM table2;
- Use the
NOT IN
operator: You can use theNOT IN
operator to compare the rows in two tables and return only the rows that are present in the first table but not in the second. For example:
SELECT * FROM table1
WHERE column1 NOT IN (SELECT column1 FROM table2);
- Use the
LEFT JOIN
operator: You can use theLEFT JOIN
operator to compare the rows in two tables and return all the rows from the left table (table1
), along with any matching rows from the right table (table2
). If there is no match, the right side will be filled withNULL
values. For example:
SELECT * FROM table1
LEFT JOIN table2
ON table1.column1 = table2.column1;
- You can then use the
WHERE
clause to filter out the rows where the values are the same in both tables. For example:
SELECT * FROM table1
LEFT JOIN table2
ON table1.column1 = table2.column1
WHERE table1.column2 <> table2.column2 OR table2.column2 IS NULL;
This will return all the rows from table1
that have different values in column2
compared to table2
, or where there is no matching row in table2
.