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Categories / Oracle PLSQL / Aggregate Functions

 

Using GROUP BY would tell us how many cars from each vendor we have on the lot

SQL> SQL> SQL> CREATE TABLE cars   2  (   3    MAKER  VARCHAR (25),   4    MODEL  VARCHAR (25),   5    PRICE  NUMERIC   6  ); Table created. SQL> SQL> INSERT INTO CARS VALUES('CHRYSLER','CROSSFIRE',33620); 1 row created. SQL> INSERT INTO CARS VALUES('CHRYSLER','300M',29185); 1 row created. SQL> INSERT INTO CARS VALUES('HONDA','CIVIC',15610); 1 row created. SQL> INSERT INTO CARS VALUES('HONDA','ACCORD',19300); 1 row created. SQL> SQL> INSERT INTO CARS VALUES('FORD','MUSTANG',15610); 1 row created. SQL> INSERT INTO CARS VALUES('FORD','LATESTnGREATEST',NULL); 1 row created. SQL> INSERT INTO CARS VALUES('FORD','FOCUS',13005); 1 row created. SQL> SQL> SQL> SQL> SELECT   2     Maker,   3     COUNT(price)cars_count   4  FROM cars   5  GROUP BY maker; MAKER                     CARS_COUNT ------------------------- ---------- HONDA                           2.00 FORD                            2.00 CHRYSLER                        2.00 SQL> SQL> drop table cars; Table dropped. SQL> SQL>