In SQL Server, TOP might be accustomed to return the very first n quantity of rows inside a query. For instance,
Choose Best Players * FROM customers ORDER BY idmight be employed to return the very first 100 people who registered for any site. (This isn't always the easiest way, I'm simply using it for example).
My real question is - What's the equal to TOP in other databases, for example Oracle, MySQL, PostgreSQL, etc? If there's no equivalent keyword, what workarounds are you able to recommend to offer the same result?
To choose first
SELECT * FROM Table ORDER BY column LIMIT 100
SELECT * FROM ( SELECT t.* FROM table ORDER BY column ) WHERE rownum <= 100
Note that you'll require a subquery here. If you do not give a subquery,
ROWNUM will choose first
10 rows in random order after which sort them by
To choose rows between
SELECT * FROM TABLE ORDER BY column LIMIT 100, 200
SELECT * FROM Table ORDER BY column OFFSET 100 LIMIT 200
SELECT * FROM ( SELECT t.*, ROW_NUMBER() OVER (ORER BY column) AS rn FROM table ) WHERE rn >= 100 AND rownum <= 200
Observe that an effort to simplify it with
ROWNUM BETWEEN 100 AND 200 (instead of
rn BETWEEN 100 AND 200 within the outer query) will return nothing in
RN BETWEEN 100 AND 200 works in
Oracle too but is less capable.
Begin to see the article during my blog for performance particulars:
For Postgres and MySQL it is the LIMIT keyword.
SELECT * FROM users ORDER BY id LIMIT 100;
This really is standard SQL (Oracle and SQL Server implement it). It is really an illustration of coming back as much as 100 rows:
SELECT ID_CONTROL FROM (SELECT ROW_NUMBER() OVER (ORDER BY ID_CONTROL) ROWNUMBER, ID_CONTROL FROM IWS_CONTROL WHERE CURRENT_STATE = 15 AND CURRENT_STATUS=0) A WHERE ROWNUMBER <= 100)
SELECT * FROM foo ORDER BY bar LIMIT 100
You should use RANK() and DENSE_RANK() in Oracle. Here is really a connect to AskTom website explaining how you can to pagination and top-n queries with DENSE_RANK in Oracle.
In DB2 you'd build your query seem like this:
Choose * FROM tblData FETCH FIRST 10 ROWS ONLY
In SQL Anywhere, it's just like SQL Server:
SELECT TOP 100 * FROM users ORDER BY id
You may also start in the center of the end result set if you would like:
SELECT TOP 100 START AT 50 * FROM users ORDER BY id
will get the 50th through 150th rows from the result set.
In Oracle you need to make use of a TOP-N query.
select * from (SELECT * FROM foo where foo_id=[number] order by foo_id desc) where rownum <= 3
This can enable you to get the very best three results (because I order by desc within the sub query)