Delete Result Rows from a Table in SQL

I have 2 tables named BM_Data1 & BM_Data1_May62019. Both Tables contains the same data as BM_Data1_May62019 is the copy of BM_Data1 table. But BM_Data1 has some extra rows, How can I delete those extra rows from BM_Data1 and make it same like BM_Data1_May62019.

I got the extra rows using the following query.

SELECT * FROM
(SELECT * FROM BM_DATA1
EXCEPT
SELECT * FROM BM_DATA1_MAY62019) a

There are 7803 extra rows, how can I delete them from BM_Data1 table?

Thank You

Answer

As you confirmed RECID is common in both table with unique value, you can try this following script

DELETE FROM BM_DATA1
WHERE RECID NOT IN
(
    SELECT RECID FROM BM_DATA1_MAY62019
)