SELECT SUBSTR(A.COLUMN_NAME,1,15) CNAME FROM USER_CONS_COLUMNS A, USER_CONSTRAINTS B WHERE A.TABLE_NAME = UPPER('&TAB_NAME') AND A.TABLE_NAME = B.TABLE_NAME AND A.CONSTRAINT_NAME = B.CONSTRAINT_NAME AND B.CONSTRAINT_TYPE = 'P' ORDER BY 1
SQLSERVER
SELECT C.NAME CNAME FROM SYSOBJECTS O, SYSCOLUMNS C, SYSINDEXES I, SYSINDEXKEYS K WHERE O.ID = C.ID AND I.ID = K.ID AND I.INDID = K.INDID AND K.ID = C.ID AND K.COLID = C.COLID AND I.NAME LIKE 'PK%' AND O.NAME = 'TAB_NAME'
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