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Reputation: 7865
What is the purpose of Order By 1 in SQL select statement?
I'm reading through some old code at work, and have noticed that there are several views with an order by 1 clause. What does this accomplish?
Example:
Create view v_payment_summary AS
SELECT A.PAYMENT_DATE,
(SELECT SUM(paymentamount)
FROM payment B
WHERE PAYMENT_DATE = B.PAYMENT_DATE
and SOME CONDITION) AS SUM_X,
(SELECT SUM(paymentamount)
FROM payment B
WHERE PAYMENT_DATE = B.PAYMENT_DATE
and SOME OTHER CONDITION) AS SUM_Y
FROM payment A
ORDER BY 1;
Upvotes: 222
Views: 278993
Answers (8)
Md Samrat Akbor
Reputation: 75
SELECT case when b.salary is null then a.employee_id else b.employee_id end employee_id FROM Employees a FULL JOIN Salaries b on b. employee_id = a.employee_id WHERE b.salary is null or a.employee_id is null order by 1
it simply means sorting the view or table by 1st column of the query's result. above this query, the 'employee_id' column is the first column but this column is selected from two tables that's why to use this type of sorting.
Upvotes: 0
nicV
Reputation: 690
As mentioned in other answers ORDER BY 1 orders by the first column.
I came across another example of where you might use it though. We have certain queries which need to be ordered select the same column. You would get a SQL error if ordering by Name in the below.
SELECT Name, Name FROM Segment ORDER BY 1
Upvotes: 3
kshitij
Reputation: 331
it simply means sorting the view or table by 1st column of query's result.
Upvotes: 31
kriss
Reputation: 171
An example here from a sample test WAMP server database:-
mysql> select * from user_privileges;
| GRANTEE | TABLE_CATALOG | PRIVILEGE_TYPE | IS_GRANTABLE |
+--------------------+---------------+-------------------------+--------------+
| 'root'@'localhost' | def | SELECT | YES |
| 'root'@'localhost' | def | INSERT | YES |
| 'root'@'localhost' | def | UPDATE | YES |
| 'root'@'localhost' | def | DELETE | YES |
| 'root'@'localhost' | def | CREATE | YES |
| 'root'@'localhost' | def | DROP | YES |
| 'root'@'localhost' | def | RELOAD | YES |
| 'root'@'localhost' | def | SHUTDOWN | YES |
| 'root'@'localhost' | def | PROCESS | YES |
| 'root'@'localhost' | def | FILE | YES |
| 'root'@'localhost' | def | REFERENCES | YES |
| 'root'@'localhost' | def | INDEX | YES |
| 'root'@'localhost' | def | ALTER | YES |
| 'root'@'localhost' | def | SHOW DATABASES | YES |
| 'root'@'localhost' | def | SUPER | YES |
| 'root'@'localhost' | def | CREATE TEMPORARY TABLES | YES |
| 'root'@'localhost' | def | LOCK TABLES | YES |
| 'root'@'localhost' | def | EXECUTE | YES |
| 'root'@'localhost' | def | REPLICATION SLAVE | YES |
| 'root'@'localhost' | def | REPLICATION CLIENT | YES |
| 'root'@'localhost' | def | CREATE VIEW | YES |
| 'root'@'localhost' | def | SHOW VIEW | YES |
| 'root'@'localhost' | def | CREATE ROUTINE | YES |
| 'root'@'localhost' | def | ALTER ROUTINE | YES |
| 'root'@'localhost' | def | CREATE USER | YES |
| 'root'@'localhost' | def | EVENT | YES |
| 'root'@'localhost' | def | TRIGGER | YES |
| 'root'@'localhost' | def | CREATE TABLESPACE | YES |
| 'root'@'127.0.0.1' | def | SELECT | YES |
| 'root'@'127.0.0.1' | def | INSERT | YES |
| 'root'@'127.0.0.1' | def | UPDATE | YES |
| 'root'@'127.0.0.1' | def | DELETE | YES |
| 'root'@'127.0.0.1' | def | CREATE | YES |
| 'root'@'127.0.0.1' | def | DROP | YES |
| 'root'@'127.0.0.1' | def | RELOAD | YES |
| 'root'@'127.0.0.1' | def | SHUTDOWN | YES |
| 'root'@'127.0.0.1' | def | PROCESS | YES |
| 'root'@'127.0.0.1' | def | FILE | YES |
| 'root'@'127.0.0.1' | def | REFERENCES | YES |
| 'root'@'127.0.0.1' | def | INDEX | YES |
| 'root'@'127.0.0.1' | def | ALTER | YES |
| 'root'@'127.0.0.1' | def | SHOW DATABASES | YES |
| 'root'@'127.0.0.1' | def | SUPER | YES |
| 'root'@'127.0.0.1' | def | CREATE TEMPORARY TABLES | YES |
| 'root'@'127.0.0.1' | def | LOCK TABLES | YES |
| 'root'@'127.0.0.1' | def | EXECUTE | YES |
| 'root'@'127.0.0.1' | def | REPLICATION SLAVE | YES |
| 'root'@'127.0.0.1' | def | REPLICATION CLIENT | YES |
| 'root'@'127.0.0.1' | def | CREATE VIEW | YES |
| 'root'@'127.0.0.1' | def | SHOW VIEW | YES |
| 'root'@'127.0.0.1' | def | CREATE ROUTINE | YES |
| 'root'@'127.0.0.1' | def | ALTER ROUTINE | YES |
| 'root'@'127.0.0.1' | def | CREATE USER | YES |
| 'root'@'127.0.0.1' | def | EVENT | YES |
| 'root'@'127.0.0.1' | def | TRIGGER | YES |
| 'root'@'127.0.0.1' | def | CREATE TABLESPACE | YES |
| 'root'@'::1' | def | SELECT | YES |
| 'root'@'::1' | def | INSERT | YES |
| 'root'@'::1' | def | UPDATE | YES |
| 'root'@'::1' | def | DELETE | YES |
| 'root'@'::1' | def | CREATE | YES |
| 'root'@'::1' | def | DROP | YES |
| 'root'@'::1' | def | RELOAD | YES |
| 'root'@'::1' | def | SHUTDOWN | YES |
| 'root'@'::1' | def | PROCESS | YES |
| 'root'@'::1' | def | FILE | YES |
| 'root'@'::1' | def | REFERENCES | YES |
| 'root'@'::1' | def | INDEX | YES |
| 'root'@'::1' | def | ALTER | YES |
| 'root'@'::1' | def | SHOW DATABASES | YES |
| 'root'@'::1' | def | SUPER | YES |
| 'root'@'::1' | def | CREATE TEMPORARY TABLES | YES |
| 'root'@'::1' | def | LOCK TABLES | YES |
| 'root'@'::1' | def | EXECUTE | YES |
| 'root'@'::1' | def | REPLICATION SLAVE | YES |
| 'root'@'::1' | def | REPLICATION CLIENT | YES |
| 'root'@'::1' | def | CREATE VIEW | YES |
| 'root'@'::1' | def | SHOW VIEW | YES |
| 'root'@'::1' | def | CREATE ROUTINE | YES |
| 'root'@'::1' | def | ALTER ROUTINE | YES |
| 'root'@'::1' | def | CREATE USER | YES |
| 'root'@'::1' | def | EVENT | YES |
| 'root'@'::1' | def | TRIGGER | YES |
| 'root'@'::1' | def | CREATE TABLESPACE | YES |
| ''@'localhost' | def | USAGE | NO |
+--------------------+---------------+-------------------------+--------------+
85 rows in set (0.00 sec)
And when it is given additional order by PRIVILEGE_TYPE or can be given order by 3 . Notice the 3rd column (PRIVILEGE_TYPE) getting sorted alphabetically.
mysql> select * from user_privileges order by PRIVILEGE_TYPE;
+--------------------+---------------+-------------------------+--------------+
| GRANTEE | TABLE_CATALOG | PRIVILEGE_TYPE | IS_GRANTABLE |
+--------------------+---------------+-------------------------+--------------+
| 'root'@'127.0.0.1' | def | ALTER | YES |
| 'root'@'::1' | def | ALTER | YES |
| 'root'@'localhost' | def | ALTER | YES |
| 'root'@'::1' | def | ALTER ROUTINE | YES |
| 'root'@'localhost' | def | ALTER ROUTINE | YES |
| 'root'@'127.0.0.1' | def | ALTER ROUTINE | YES |
| 'root'@'127.0.0.1' | def | CREATE | YES |
| 'root'@'::1' | def | CREATE | YES |
| 'root'@'localhost' | def | CREATE | YES |
| 'root'@'::1' | def | CREATE ROUTINE | YES |
| 'root'@'localhost' | def | CREATE ROUTINE | YES |
| 'root'@'127.0.0.1' | def | CREATE ROUTINE | YES |
| 'root'@'::1' | def | CREATE TABLESPACE | YES |
| 'root'@'localhost' | def | CREATE TABLESPACE | YES |
| 'root'@'127.0.0.1' | def | CREATE TABLESPACE | YES |
| 'root'@'::1' | def | CREATE TEMPORARY TABLES | YES |
| 'root'@'localhost' | def | CREATE TEMPORARY TABLES | YES |
| 'root'@'127.0.0.1' | def | CREATE TEMPORARY TABLES | YES |
| 'root'@'localhost' | def | CREATE USER | YES |
| 'root'@'127.0.0.1' | def | CREATE USER | YES |
| 'root'@'::1' | def | CREATE USER | YES |
| 'root'@'localhost' | def | CREATE VIEW | YES |
| 'root'@'127.0.0.1' | def | CREATE VIEW | YES |
| 'root'@'::1' | def | CREATE VIEW | YES |
| 'root'@'127.0.0.1' | def | DELETE | YES |
| 'root'@'::1' | def | DELETE | YES |
| 'root'@'localhost' | def | DELETE | YES |
| 'root'@'::1' | def | DROP | YES |
| 'root'@'localhost' | def | DROP | YES |
| 'root'@'127.0.0.1' | def | DROP | YES |
| 'root'@'127.0.0.1' | def | EVENT | YES |
| 'root'@'::1' | def | EVENT | YES |
| 'root'@'localhost' | def | EVENT | YES |
| 'root'@'127.0.0.1' | def | EXECUTE | YES |
| 'root'@'::1' | def | EXECUTE | YES |
| 'root'@'localhost' | def | EXECUTE | YES |
| 'root'@'127.0.0.1' | def | FILE | YES |
| 'root'@'::1' | def | FILE | YES |
| 'root'@'localhost' | def | FILE | YES |
| 'root'@'localhost' | def | INDEX | YES |
| 'root'@'127.0.0.1' | def | INDEX | YES |
| 'root'@'::1' | def | INDEX | YES |
| 'root'@'::1' | def | INSERT | YES |
| 'root'@'localhost' | def | INSERT | YES |
| 'root'@'127.0.0.1' | def | INSERT | YES |
| 'root'@'127.0.0.1' | def | LOCK TABLES | YES |
| 'root'@'::1' | def | LOCK TABLES | YES |
| 'root'@'localhost' | def | LOCK TABLES | YES |
| 'root'@'127.0.0.1' | def | PROCESS | YES |
| 'root'@'::1' | def | PROCESS | YES |
| 'root'@'localhost' | def | PROCESS | YES |
| 'root'@'::1' | def | REFERENCES | YES |
| 'root'@'localhost' | def | REFERENCES | YES |
| 'root'@'127.0.0.1' | def | REFERENCES | YES |
| 'root'@'::1' | def | RELOAD | YES |
| 'root'@'localhost' | def | RELOAD | YES |
| 'root'@'127.0.0.1' | def | RELOAD | YES |
| 'root'@'::1' | def | REPLICATION CLIENT | YES |
| 'root'@'localhost' | def | REPLICATION CLIENT | YES |
| 'root'@'127.0.0.1' | def | REPLICATION CLIENT | YES |
| 'root'@'::1' | def | REPLICATION SLAVE | YES |
| 'root'@'localhost' | def | REPLICATION SLAVE | YES |
| 'root'@'127.0.0.1' | def | REPLICATION SLAVE | YES |
| 'root'@'127.0.0.1' | def | SELECT | YES |
| 'root'@'::1' | def | SELECT | YES |
| 'root'@'localhost' | def | SELECT | YES |
| 'root'@'127.0.0.1' | def | SHOW DATABASES | YES |
| 'root'@'::1' | def | SHOW DATABASES | YES |
| 'root'@'localhost' | def | SHOW DATABASES | YES |
| 'root'@'127.0.0.1' | def | SHOW VIEW | YES |
| 'root'@'::1' | def | SHOW VIEW | YES |
| 'root'@'localhost' | def | SHOW VIEW | YES |
| 'root'@'localhost' | def | SHUTDOWN | YES |
| 'root'@'127.0.0.1' | def | SHUTDOWN | YES |
| 'root'@'::1' | def | SHUTDOWN | YES |
| 'root'@'::1' | def | SUPER | YES |
| 'root'@'localhost' | def | SUPER | YES |
| 'root'@'127.0.0.1' | def | SUPER | YES |
| 'root'@'127.0.0.1' | def | TRIGGER | YES |
| 'root'@'::1' | def | TRIGGER | YES |
| 'root'@'localhost' | def | TRIGGER | YES |
| 'root'@'::1' | def | UPDATE | YES |
| 'root'@'localhost' | def | UPDATE | YES |
| 'root'@'127.0.0.1' | def | UPDATE | YES |
| ''@'localhost' | def | USAGE | NO | +--------------------+---------------+-------------------------+--------------+
85 rows in set (0.00 sec)
DEFINITIVELY, a long answer and alot of scrolling.
Also I struggled hard to pass the output of the queries to a text file.
Here is how to do that without using the annoying into outfile thing-
tee E:/sqllogfile.txt;
And when you are done, stop the logging-
tee off;
Hope it adds more clarity.
Upvotes: -2
daven11
Reputation: 3025
This is useful when you use set based operators e.g. union
select cola
from tablea
union
select colb
from tableb
order by 1;
Upvotes: 55
OMG Ponies
Reputation: 332631
This:
ORDER BY 1
...is known as an "Ordinal" - the number stands for the column based on the number of columns defined in the SELECT clause. In the query you provided, it means:
ORDER BY A.PAYMENT_DATE
It's not a recommended practice, because:
- It's not obvious/explicit
- If the column order changes, the query is still valid so you risk ordering by something you didn't intend
Upvotes: 293
CTKeane
Reputation: 670
This will sort your results by the first column returned. In the example it will sort by payment_date.
Upvotes: 7
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