Alter table to add new constraint for new added column : Alter Table « Table « Oracle PL/SQL Tutorial

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Oracle PL/SQL Tutorial » Table » Alter Table 
6. 3. 12. Alter table to add new constraint for new added column
SQL>
SQL>
SQL> -- create demo table
SQL> create table Employee(
  2    ID                 VARCHAR2(BYTE)         NOT NULL primary key,
  3    First_Name         VARCHAR2(10 BYTE),
  4    Last_Name          VARCHAR2(10 BYTE),
  5    Start_Date         DATE,
  6    End_Date           DATE,
  7    Salary             Number(8,2),
  8    City               VARCHAR2(10 BYTE),
  9    Description        VARCHAR2(15 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  /

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'), 6661.78'Vancouver','Tester')
  3  /

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'), 6544.78'Vancouver','Tester')
  3  /

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'), 2344.78'Vancouver','Manager')
  3  /

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'), 2334.78'Vancouver','Tester')
  3  /

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'), 4322.78,'New York',  'Tester')
  3  /

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'), 7897.78,'New York',  'Manager')
  3  /

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'), 1232.78,'Vancouver', 'Tester')
  3  /

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    6661.78 Vancouver  Tester
03   James                Smith                12-DEC-78 15-MAR-90    6544.78 Vancouver  Tester
04   Celia                Rice                 24-OCT-82 21-APR-99    2344.78 Vancouver  Manager
05   Robert               Black                15-JAN-84 08-AUG-98    2334.78 Vancouver  Tester
06   Linda                Green                30-JUL-87 04-JAN-96    4322.78 New York   Tester
07   David                Larry                31-DEC-90 12-FEB-98    7897.78 New York   Manager
 desc employee;

ID   FIRST_NAME           LAST_NAME            START_DAT END_DATE      SALARY CITY       DESCRIPTION
---- -------------------- -------------------- --------- --------- ---------- ---------- ---------------
08   James                Cat                  17-SEP-96 15-APR-02    1232.78 Vancouver  Tester

rows selected.

SQL>
SQL> alter table employee
  2   add (
  3        gender   varchar(10)
  4  );

Table altered.

SQL>
SQL> alter table employee
  2      add constraint ck_gender
  3      check (gender in ('MALE', 'FEMALE'));

Table altered.

SQL>
SQL>
SQL>
SQL> desc employee;
 Name                      Null?    Type
 --------------------------------------------------------------------------
 ID                        NOT NULL VARCHAR2(4)
 FIRST_NAME                         VARCHAR2(10)
 LAST_NAME                          VARCHAR2(10)
 START_DATE                         DATE
 END_DATE                           DATE
 SALARY                             NUMBER(8,2)
 CITY                               VARCHAR2(10)
 DESCRIPTION                        VARCHAR2(15)
 GENDER                             VARCHAR2(10)

SQL>
SQL>
SQL> -- clean the table
SQL> drop table Employee
  2  /

Table dropped.
6. 3. Alter Table
6. 3. 1. Altering a Table
6. 3. 2. Some of the aspects of a column you can modify using ALTER TABLE
6. 3. 3. Adding a Column
6. 3. 4. ADD initially_created DATE DEFAULT SYSDATE NOT NULL;
6. 3. 5. Changing the Size of a Column
6. 3. 6. Decrease the length of a column
6. 3. 7. Changing the Precision of a Numeric Column
6. 3. 8. Decrease the precision of a numeric column
6. 3. 9. Changing the Data Type of a Column
6. 3. 10. Fill data into new added table column
6. 3. 11. Changing the Default Value of a Column
6. 3. 12. Alter table to add new constraint for new added column
6. 3. 13. ALTER TABLE to DISABLE a CONSTRAINT
6. 3. 14. Alter table to add primary key
6. 3. 15. Alter table to add primary key across more than one columns
6. 3. 16. Dropping a Column
6. 3. 17. New added columns are empty
6. 3. 18. Alter table to add unique with tablespace and storage setting
6. 3. 19. Alter table to add primary key with tablespace and storage setting
6. 3. 20. alter table nologging
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