How to Create a Non-unique Primary Key
The primary key in a table is just like the spine of a human being, which integrates all data in the table. In practice, we… Read More »How to Create a Non-unique Primary Key
Index
Oracle DROP INDEX Syntax for All Releases
Here is the list of DROP INDEX Syntax for All Releases of Oracle Database. DROP INDEX Syntax for Oracle Database 21c DROP INDEX Syntax for… Read More »Oracle DROP INDEX Syntax for All Releases
Oracle ALTER INDEX Syntax for All Releases
Here is the list of ALTER INDEX Syntax for All Releases of Oracle Database. ALTER INDEX syntax for Oracle Database 21c ALTER INDEX syntax for… Read More »Oracle ALTER INDEX Syntax for All Releases
Oracle CREATE INDEX Syntax for All Releases
Here is the list of CREATE INDEX Syntax for All Releases of Oracle Database. CREATE INDEX Syntax for Oracle Database 21c CREATE INDEX Syntax for… Read More »Oracle CREATE INDEX Syntax for All Releases
Can I Create Index for Table Belonging to Different User
Yes, you can, but you need a special privilege. Try the following example: SQL> conn oe/oe@orcl Connected. SQL> create index oe.customer_id_gen_idx on sh.customers (cust_id, cust_gender);… Read More »Can I Create Index for Table Belonging to Different User
How to Resolve ORA-02429: cannot drop index used for enforcement of unique/primary key
ORA-02429 ORA-02429 means that the index you want to drop is a primary key. SQL> drop index hr.JHIST_EMP_ID_ST_DATE_PK; drop index hr.JHIST_EMP_ID_ST_DATE_PK … Read More »How to Resolve ORA-02429: cannot drop index used for enforcement of unique/primary key
ORA-12991: column is referenced in a multi-column constraint
ORA-12991 ORA-12991 means that the column you want to drop is bound to some multi-column constraint. Usually, it's a primary key constraint, but not always.… Read More »ORA-12991: column is referenced in a multi-column constraint
How to Modify Primary Key
Modify Primary Key Sometimes, developers may design a better primary key to support the uniqueness of a table and they want to replace the current… Read More »How to Modify Primary Key
How to Drop Primary Key
Drop Primary Key Primary key is sort of a constraint rather than an index, you should treat it as a constraint first so as to… Read More »How to Drop Primary Key
How to Add Primary Key
Add Primary Key There're 3 basic ways to create a primary key for a table. 1. System-Generated Name You don't have to provide a name… Read More »How to Add Primary Key