WHAT IS USE OF COALESCE KEYWORD

step 1:

CREATE TABLE COLLEGE(SID NVARCHAR(10),SNAME NVARCHAR(20),PLACE NVARCHAR(20))

Step 2:

INSERT INTO COLLEGE VALUES(1,'SURESH',NULL),(NULL,'RAMESH','PUDUKKOTTAI'),(3,'RAMU','COIMBATORE')

-- ABOVE QUERY WILL RUN ONLY SQL 2008,2012

STEP 3:

SELECT COALESCE(SID,SNAME,PLACE) AS 'STUDNAME' FROM COLLEGE

STEP 4:

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