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The syntax to create a primary key using the ALTER TABLE statement in Oracle/PLSQL is:.
Oracle alter table add primary key using index example. Let’s try to use a non-unique index this time. This will create a table named Mytable with three columns. If you need to primary key constraint to a table after the fact, simply use the alter table command.
SQL> create table Mytable (name varchar2(100), msg varchar2(500), id number);. ALTER TABLE vendors ADD CONSTRAINT pk_vendors PRIMARY KEY (vendor_id);. ALTER TABLE supplier ADD CONSTRAINT supplier_pk PRIMARY KEY (supplier_id);.
Alter table mytab add primary key (id) using index mytab_idx ORA - :. Let's look at an example of how to create a primary key using the ALTER TABLE statement in Oracle. We can have both the Primary key and Unique key on the oracle table.Here is the example demonstrating it SQL> CREATE TABLE DEPT_MASTER (dept_nr NUMBER PRIMARY KEY, dept_name varchar2 (100) UNIQUE, dept_status NUMBER (1,0) NOT NULL, created_at date);.
The following example creates the vendors table first and then adds a primary key constraint to it:. 2) create index idx_t on t(a, b);. ALTER TABLE table_name ADD CONSTRAINT constraint_name PRIMARY KEY (column1, column2,.
SQL> select CONSTRAINT_NAME,INDEX_NAME,CONSTRAINT_TYPE from user_constraints where TABLE_NAME='DEPT_MASTER';. As per your previous posting I carried out this testing:. Alter table t drop primary key;.
SQL> alter table DEPT_MASTER add primary key ( dept_nr);. Here the primary key column gets a meaningful name (pk_my_status) instead of a system generated primary key name. CONSTRAINT_NAME INDEX_NAME CONST SYS_C C SYS_C C SYS.
We can still do something else:. CREATE TABLE vendors ( vendor_id NUMBER , vendor_name VARCHAR2 ( 255 ) NOT NULL , address VARCHAR2 ( 255 ) NOT NULL );. Alter table t add primary key (b) using index.
INDEX_NAME UNIQUENES ----- ----- IDX_T NONUNIQUE And one limitation I have noticed is that the column defined as PK has to be leading columns on the index used:. Create a table using the following script. 3) alter table t add primary key (a) using index idx_t;.
ALTER TABLE table_name ADD CONSTRAINT constraint_name PRIMARY KEY (column1, column2, );. SQL> select index_name, uniqueness from user_indexes where table_name = 'T';. Lets see how to add the Primary after table creation.
Specified index cannot be used to enforce the constraint. 1) create table t (a int, b int);. That makes the alter table add constraint primary key a better option than the create table example above.
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