Oracle PL/SQL/System Tables Views/USER CONSTRAINTS
Содержание
Get a list of constraints defined on the employee table from User_Constraints
SQL>
SQL> -- create demo table
SQL> create table Employee(
2 ID VARCHAR2(4 BYTE) NOT NULL,
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 /
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"), 6661.78, "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"), 6544.78, "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"), 2344.78, "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"), 2334.78, "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"), 4322.78,"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"), 7897.78,"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"), 1232.78,"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 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
08 James Cat 17-SEP-96 15-APR-02 1232.78 Vancouver Tester
8 rows selected.
SQL>
SQL>
SQL> --Get a list of constraints defined on the employee table
SQL>
SQL> SELECT constraint_name, constraint_type,
2 search_condition
3 FROM USER_CONSTRAINTS
4 WHERE table_name ="EMPLOYEE";
CONSTRAINT_NAME C SEARCH_CONDITION
------------------------------ - --------------------------------------------------------------------------------
SYS_C004876 C "ID" IS NOT NULL
SQL>
SQL>
SQL> -- clean the table
SQL> drop table Employee
2 /
Table dropped.
SQL>
SQL>
SQL>
Join user_constraints and user_cons_columns table
SQL>
SQL> SELECT dc.table_name, dcc.column_name, dcc.position,
2 dcc.constraint_name, dc.constraint_type, dc.search_condition
3 FROM user_constraints dc, user_cons_columns dcc
4 WHERE dcc.table_name = dc.table_name
5 AND dcc.owner = dc.owner
6 AND dcc.constraint_name = dc.constraint_name
7 and rownum < 50
8 ORDER BY dcc.table_name, dcc.owner, dcc.position, dcc.column_name;
no rows selected
Output user constraints in details
SQL>
SQL>
SQL>
SQL> col constraint_name format a15
SQL> col table_name format a15
SQL> col type format a6
SQL> break on table_name page
SQL>
SQL> select table_name
2 , constraint_name
3 , case constraint_type
4 when "P" then "PRIKEY"
5 when "U" then "UNIQUE"
6 when "C" then " CHECK"
7 when "R" then "FORKEY"
8 else " OTHER"
9 end as type
10 , status
11 from user_constraints
12 order by table_name
13 , type;
TABLE_NAME CONSTRAINT_NAME TYPE STATUS
--------------- --------------- ------ --------
CUST_NO_KEY_TAB SYS_C005404 PRIKEY ENABLED
LE
TABLE_NAME CONSTRAINT_NAME TYPE STATUS
--------------- --------------- ------ --------
CUST_WITH_VARRA SYS_C004799 PRIKEY ENABLED
Y_TEMP_TABLE
TABLE_NAME CONSTRAINT_NAME TYPE STATUS
--------------- --------------- ------ --------
DEMO SYS_C005536 PRIKEY ENABLED
TABLE_NAME CONSTRAINT_NAME TYPE STATUS
--------------- --------------- ------ --------
EMPLOYEETEMPTAB SYS_C008156 PRIKEY ENABLED
LE
TABLE_NAME CONSTRAINT_NAME TYPE STATUS
--------------- --------------- ------ --------
EMPTEMPTABLE SYS_C009072 PRIKEY ENABLED
TABLE_NAME CONSTRAINT_NAME TYPE STATUS
--------------- --------------- ------ --------
INVENTORY_TBL SYS_C006948 PRIKEY ENABLED
TABLE_NAME CONSTRAINT_NAME TYPE STATUS
--------------- --------------- ------ --------
IT SYS_C005376 PRIKEY ENABLED
TABLE_NAME CONSTRAINT_NAME TYPE STATUS
--------------- --------------- ------ --------
IX SYS_IOT_TOP_161 PRIKEY ENABLED
35
TABLE_NAME CONSTRAINT_NAME TYPE STATUS
--------------- --------------- ------ --------
MYTABLE1 SYS_C009993 PRIKEY ENABLED
TABLE_NAME CONSTRAINT_NAME TYPE STATUS
--------------- --------------- ------ --------
P SYS_C0010267 PRIKEY ENABLED
TABLE_NAME CONSTRAINT_NAME TYPE STATUS
--------------- --------------- ------ --------
P1 SYS_C005096 PRIKEY ENABLED
TABLE_NAME CONSTRAINT_NAME TYPE STATUS
--------------- --------------- ------ --------
TMP SYS_C007377 CHECK ENABLED
TABLE_NAME CONSTRAINT_NAME TYPE STATUS
--------------- --------------- ------ --------
WORKING_CUSTOME SYS_C005237 CHECK ENABLED
RS
SYS_C005236 CHECK ENABLED
TABLE_NAME CONSTRAINT_NAME TYPE STATUS
--------------- --------------- ------ --------
WORKING_EMPLOYE SYS_C008778 CHECK ENABLED
ES
SYS_C008777 CHECK ENABLED
TABLE_NAME CONSTRAINT_NAME TYPE STATUS
--------------- --------------- ------ --------
WORKING_EMPS SYS_C009664 CHECK ENABLED
SYS_C009665 CHECK ENABLED
18 rows selected.
SQL>
SQL> --clear breaks
SQL>
Query user_constraints for constriant name, type, table name
SQL>
SQL>
SQL> select constraint_name, constraint_type,
2 table_name, r_constraint_name
3 from user_constraints
4 where constraint_name = "DEPARTMENT_FK_MGR_NO";
no rows selected