Merge Query

1. Oracle:

"MERGE into MHGROUP.proj_access m using dual on " +
"(PRJ_ID = '" + WS_PrjID + "' AND USER_GP_ID = '" + smrIDs[i] + "')" +
"when not matched then " +
"insert (PRJ_ID,OBJECT_TYPE,USER_GP_ID,ACCESS_RIGHT) " +
"values ('" + WS_PrjID + "','U','" + smrIDs[i] + "','" + accessLevel + "')" +
"when matched then " +
"update set ACCESS_RIGHT = '" + accessLevel + "'";

2. MSSQL:

insert into customer_info(company_name,customerid,status)

Select 'abc','CD',1

Where not exists(select * from customer_info where cid=2)