How to check all constraints on a table in oracle: how to check all constraints on a table in oracle using dba_constraints and dba_cons_columns data dictionary views in Oracle database we cover how to use Oracle create table command to create a table with foreign key /primary keyĪlter table drop column in oracle: Check out how to drop column using alter table drop column oracle, alter table set unused column oracle and alter table drop unused columns Oracle create a table: Tables are the basic unit of data storage in an Oracle Database. Details about the fast add column feature introduced in oracle 11g also given Please do provide feedbackĪlter table in oracle : Alter table in oracle is used to modify a column, drop and add constraints, change the data type of the table column, change the table storage parametersĪlter table add column oracle: Useful insight into How to alter table add column oracle. Hope you like this post on alter table rename column in oracle. SQL> create or replace view dept_vw as select dept_nr_new,dept_name from DEPT_MASTER Warning: View altered with compilation errors. SQL> select status from user_objects where object_name='DEPT_VW' SQL> create view dept_vw as select dept_nr,dept_name from DEPT_MASTER Let’s see this with an example SQL> CREATE TABLE DEPT_MASTER ( (3) You can rename the column if you have the procedure, views on that table, and column.īut after the rename, these objects will become invalid and you have to modify the view and package to compile it. We can see from the previous example, the foreign key constraint starts to point to the new column name automatically. PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1īUFFER_POOL DEFAULT FLASH_CACHE DEFAULT CELL_FLASH_CACHE DEFAULT) TABLESPACE "TOOLS" PCTFREE 10 PCTUSED 40 INITRANS 1 MAXTRANS 255 NOCOMPRESS LOGGING REFERENCES "SCOTT"."DEPT" ("DEPTNO_NEW") ENABLE Insert into dept values(40, 'RESEARCH', 'MUMBAI') Insert into dept values(30, 'RESEARCH', 'DELHI')
Insert into dept values(20, 'RESEARCH', 'DALLAS') SQL> insert into DEPT values(10, 'ACCOUNTING', 'NEW YORK') Let’s take another example with foreign key constraints also SQL> CREATE TABLE "DEPT"ĬONSTRAINT "PK_DEPT" PRIMARY KEY ("DEPTNO")ĬONSTRAINT "PK_EMP" PRIMARY KEY ("EMPNO"),ĬONSTRAINT "FK_DEPTNO" FOREIGN KEY ("DEPTNO") You can see from the previous example, check constraint get changed to the new column name, and also primary key also get changed to a new column PCTFREE 10 PCTUSED 40 INITRANS 1 MAXTRANS 255 USING INDEX PCTFREE 10 INITRANS 2 MAXTRANS 255 SQL> select dbms_metadata.get_ddl('TABLE','EMP','SCOTT') from dual ĬONSTRAINT "PK_EMP" PRIMARY KEY ("EMP_NO") SQL> alter table emp rename column sal to salary SQL> alter table emp rename column EMPNO to EMP_NO It will automatically start pointing to the new column name SQL> CREATE TABLE "EMP"ĬONSTRAINT "PK_EMP" PRIMARY KEY ("EMPNO") (2) You can rename the column even we have a primary key, constraint present on it. You have to execute separate statements to change the multiple columns. So you get the ORA error when trying to include two-column in it. RENAME COLUMN DEPT_NR_NEW to DEPT_NR,COLUMN DEPT_NAME to DEPT_N ORA-23290: This operation may not be combined with any other operation RENAME COLUMN DEPT_NR_NEW to DEPT_NR, DEPT_NAME to DEPT_N
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