Interested to Buy Any Domain ? << Click Here >> for more details...
Differences between UNIQUE and DISTINCT in select statements
- 26 Answers
- 135668 Views
- ABS, DELL, Deloitte, Hewitt, Oracle, Verinon Technology Solutions, Wipro, I also Faced
- E-Mail Answers
Answer Posted / karthicksharma
As said earlier UNIQUE is a constraint and can be used
during a table creation to prevent duplication of data .
-----------------------------------------------------
CREATING A TABLE USING UNIQUE CONSTRAINT:
=================================================
eg:
SQL> create table empl1 (name varchar2(15),no number(5)
unique);
Table created.
-----------------------------------------------------
So from this it is clearly implied that UNIQUE constraint
is used to prevent INSERTION AS WELL AS RETRIVAL of non-
duplicate data.
whereas DISTINCT clause can only be used for RETRIVAL of
non-duplicate data.
Whereas DISTINCT is a clause and cannot be used during a
table creation to limit the duplication of data.
-----------------------------------------------------
CREATING A TABLE USING DISTINCT CLAUSE:
===========================================
eg:
create table empl2(name varchar2(15),no number(5) distinct)
*
ERROR at line 1:
ORA-00907: missing right parenthesis
-----------------------------------------------------
| Is This Answer Correct ? | 7 Yes | 0 No |
Post New Answer View All Answers
How can the performance of a trigger be improved?
what are the join types in tsql? : Transact sql
What is clustered index sql?
What is difference between hql and sql?
How do you update f as m and m as f from the below table testtable?
How do I remove sql plus from windows 10?
How many functions are there in sql?
What is the maximum rows in csv?
What will you get by the cursor attribute sql%notfound?
How do I create a sql script?
How can get second highest salary in sql?
What is oracle pl sql developer?
create SQL (both DML/DDL) statements appropriate for the creation of relational structures & constraints and other objects for a given case study, the population of these tables and the manipulation (querying/updating) of the stored data. 2. Create, develop and use the PL / SQL Program Units Procedures, Functions as a progression towards Object Oriented Relational Database Programming. 3. Package a collection of logically related Procedures and Functions together to further move towards development of Objects which reflect the principle of Data Abstraction whereby only an Object specified in the Interface is accessible to the end user. 4. Select, create, and use appropriate Database Triggers to impose agreed specific constraints on a Database Table. 5. Provide a full and detailed evaluation which includes a comprehensive test execution plan and its implementation for each of the above. Consider the following case study: Perilous Printing is a medium size printing company that does work for book publishers throughout UK. The company currently has 10 offices, most of which operate autonomously, apart from salaries, which are paid by the head office. Currently the sharing and communication of data, is carried out using multi- user networked access to a centralised RDBMS. Perilous Printing jobs consist of printing books or part of books. A printing job requires the use of materials, such as paper and ink, which are assigned to a job via purchase orders. Each printing job may have several purchase orders assigned to it. Likewise, each purchase order may contain several purchase order items. The following tables form part of the transactional RDB that the company uses: office (office_no, o_addr, o_telno, o_faxno, mgr_nin) staff (staff_no, nin, fname, lname, s_addr, s_telno, gender, dob, position, taxcode, salary, office_no) publisher (pub_no, p_name, p_city, p_telno, p_faxno, credit_code, office_no) book_job (job_no, pub_no, job_date, job_desc, job_type, job_status, supervisor_nin) purchase_order (job_no, po_no, po_date) po_item (job_no, po_no, it_no, qty) item (it_no, it_desc, amt_in_stock, price) office contains details of each office and the office number (office_no) is the key. Each office has a Manager represented by the manager’s national insurance number (mgr_nin). staff contains details of staff; the staff_no is the key. The office that the member of staff works from is given by office_no. publisher contains details of publisher and the publisher number (pub_no) is the key. Publishers are registered with the nearest office in their country, given by office_no, and they are given a credit code that can have the values “AA”, “AB”, “BB”, “BC”, “CC”, “CD” and “DD”. If a publisher is to be deleted then not only the publisher’s entry from the publisher table will have to be removed but all the data associated with the particular supplier has to be deleted too book_job contains details of publishing jobs and the job number (job_no) is the key. The publisher is given by the publisher number (pub_no) and the supervisor for the job by supervisor_nin. The job type can be either null or urgent; whereas the job_status can be “ongoing” or “completed” purchase_order contains details of the purchase orders for each job and the combination of job number and a purchase order number (job_no, po_no) form the key. Each printing job may have several purchase orders assigned to it. item contains details of all materials that can be used in printing jobs and the item number (it_no) is the key. po_item contains details of the items on the purchase order and (job_no, po_no, it_no) forms the key. In the above given database schema, descriptions are strings of characters (at most 30 characters long), any dates (except the job_ date) stored cannot be after the current system date, and quantities and prices are assumed to be non-negative numbers.
How to get unique records from a table?
what is bcp? When does it used? : Sql dba
