Oracle PL/SQL/System Tables Views/USER CONSTRAINTS

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Get a list of constraints defined on the employee table from User_Constraints

   <source lang="sql">
 

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>


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Join user_constraints and user_cons_columns table

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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


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Output user constraints in details

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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>


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Query user_constraints for constriant name, type, table name

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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


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