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Categories / Oracle PLSQL / Analytical Functions

 

The direct application of a WHERE clause in the query is not allowed

SQL> SQL> SQL> -- create demo table SQL> create table Employee(   2    ID                 VARCHAR2(4 BYTE)         NOT NULL,   3    First_Name         VARCHAR2(20 BYTE),   4    Last_Name          VARCHAR2(20 BYTE),   5    Start_Date         DATE,   6    End_Date           DATE,   7    Salary             Number(8,2),   8    City               VARCHAR2(20 BYTE),   9    Description        VARCHAR2(80 BYTE)  10  )  11  / Table created. SQL> SQL> -- prepare data SQL> insert into Employee(ID,  First_Name, Last_Name, Start_Date,                     End_Date,                       Salary,  City,       Description)   2               values ('01','Jason',    'Martin',  to_date('19960725','YYYYMMDD'), to_date('20060725','YYYYMMDD'), 1234.56, 'Toronto',  'Programmer')   3  / 1 row created. SQL> insert into Employee(ID,  First_Name, Last_Name, Start_Date,                     End_Date,                       Salary,  City,       Description)   2                values('02','Alison',   'Mathews', to_date('19760321','YYYYMMDD'), to_date('19860221','YYYYMMDD'), 2234.78, 'Vancouver','Tester')   3  / 1 row created. SQL> insert into Employee(ID,  First_Name, Last_Name, Start_Date,                     End_Date,                       Salary,  City,       Description)   2                values('03','James',    'Smith',   to_date('19781212','YYYYMMDD'), to_date('19900315','YYYYMMDD'), 2324.78, 'Vancouver','Tester')   3  / 1 row created. SQL> insert into Employee(ID,  First_Name, Last_Name, Start_Date,                     End_Date,                       Salary,  City,       Description)   2                values('04','Celia',    'Rice',    to_date('19821024','YYYYMMDD'), to_date('19990421','YYYYMMDD'), 3334.78, 'Vancouver','Manager')   3  / 1 row created. SQL> insert into Employee(ID,  First_Name, Last_Name, Start_Date,                     End_Date,                       Salary,  City,       Description)   2                values('05','Robert',   'Black',   to_date('19840115','YYYYMMDD'), to_date('19980808','YYYYMMDD'), 4334.78, 'Vancouver','Tester')   3  / 1 row created. SQL> insert into Employee(ID,  First_Name, Last_Name, Start_Date,                     End_Date,                       Salary, City,        Description)   2                values('06','Linda',    'Green',   to_date('19870730','YYYYMMDD'), to_date('19960104','YYYYMMDD'), 5334.78,'New York',  'Tester')   3  / 1 row created. SQL> insert into Employee(ID,  First_Name, Last_Name, Start_Date,                     End_Date,                       Salary, City,        Description)   2                values('07','David',    'Larry',   to_date('19901231','YYYYMMDD'), to_date('19980212','YYYYMMDD'), 6334.78,'New York',  'Manager')   3  / 1 row created. SQL> insert into Employee(ID,  First_Name, Last_Name, Start_Date,                     End_Date,                       Salary, City,        Description)   2                values('08','James',    'Cat',     to_date('19960917','YYYYMMDD'), to_date('20020415','YYYYMMDD'), 7334.78,'Vancouver', 'Tester')   3  / 1 row created. SQL> SQL> SQL> SQL> -- display data in the table SQL> select * from Employee   2  / ID   FIRST_NAME           LAST_NAME            START_DAT END_DATE      SALARY CITY                 DESCRIPTION ---- -------------------- -------------------- --------- --------- ---------- -------------------- -------------------------------------------------------------------------------- 01   Jason                Martin               25-JUL-96 25-JUL-06    1234.56 Toronto              Programmer 02   Alison               Mathews              21-MAR-76 21-FEB-86    2234.78 Vancouver            Tester 03   James                Smith                12-DEC-78 15-MAR-90    2324.78 Vancouver            Tester 04   Celia                Rice                 24-OCT-82 21-APR-99    3334.78 Vancouver            Manager 05   Robert               Black                15-JAN-84 08-AUG-98    4334.78 Vancouver            Tester 06   Linda                Green                30-JUL-87 04-JAN-96    5334.78 New York             Tester 07   David                Larry                31-DEC-90 12-FEB-98    6334.78 New York             Manager 08   James                Cat                  17-SEP-96 15-APR-02    7334.78 Vancouver            Tester 8 rows selected. SQL> SQL> SQL> -- the direct application of a WHERE clause in the query is not allowed: SQL> SQL> SELECT id, first_name, salary,   2    DENSE_RANK() OVER(ORDER BY salary desc) toprank   3  FROM employee   4  WHERE DENSE_RANK() OVER(ORDER BY salary desc) <= 5; WHERE DENSE_RANK() OVER(ORDER BY salary desc) <= 5       * ERROR at line 4: ORA-30483: window  functions are not allowed here SQL> SQL> SQL> SQL> -- clean the table SQL> drop table Employee   2  / Table dropped. SQL> SQL> SQL> SQL> SQL>