Reputation: 146
I have the following SQL query :
MERGE INTO member_staging x
USING (SELECT member_id, first_name, last_name, rank FROM members) y
ON (x.member_id = y.member_id)
WHEN MATCHED THEN
UPDATE SET x.first_name = y.first_name,
x.last_name = y.last_name,
x.rank = y.rank
WHERE x.first_name <> y.first_name OR
x.last_name <> y.last_name OR
x.rank <> y.rank
WHEN NOT MATCHED THEN
INSERT(x.member_id, x.first_name, x.last_name, x.rank)
VALUES(y.member_id, y.first_name, y.last_name, y.rank);
I want to implement it in a Hive query , is there any equivalent for MERGE JOIN in HIVE ?
Upvotes: 2
Views: 6053
Reputation: 1
The MERGE statement is based on ANSI-standard SQL, so the query is pretty the same. Just switch the WHERE condition in an AND clause like below :
MERGE INTO member_staging AS x
using (SELECT member_id,
first_name,
last_name,
rank
FROM members) y
ON ( x.member_id = y.member_id )
WHEN matched AND ( x.first_name <> y.first_name OR x.last_name <> y.last_name OR
x.rank <> y.rank ) THEN
UPDATE SET x.first_name = y.first_name,
x.last_name = y.last_name,
x.rank = y.rank
WHEN NOT matched THEN
INSERT
VALUES(y.member_id,
y.first_name,
y.last_name,
y.rank);
Upvotes: 0
Reputation: 86808
Manual Entry:
Example Syntax:
MERGE INTO <target table> AS T USING <source expression/table> AS S
ON <boolean expression1>
WHEN MATCHED [AND <boolean expression2>] THEN UPDATE SET <set clause list>
WHEN MATCHED [AND <boolean expression3>] THEN DELETE
WHEN NOT MATCHED [AND <boolean expression4>] THEN INSERT VALUES<value list>
Your specific case:
MERGE INTO member_staging AS x
USING (SELECT member_id, first_name, last_name, rank FROM members) y
ON (x.member_id = y.member_id)
WHEN MATCHED AND (
x.first_name <> y.first_name OR
x.last_name <> y.last_name OR
x.rank <> y.rank
)
THEN
UPDATE SET x.first_name = y.first_name,
x.last_name = y.last_name,
x.rank = y.rank
WHEN NOT MATCHED THEN
INSERT VALUES (y.member_id, y.first_name, y.last_name, y.rank);
Upvotes: 6