How can I get limited no.of records from database into a web page using SQL query?
How to limit the number of result rows depends on the database software you are using; see the appropriate documentation. Microsoft products allow this via the keyword TOP, like so:
SELECT TOP 10
*
FROM
table_name;
MySQL, for instance, use LIMIT instead:
SELECT
*
FROM
table_name
LIMIT
10;
In Oracle Database, use ROWNUM:
SELECT
*
FROM
table_name
WHERE
ROWNUM <= 10;
See http://www.w3schools.com/sql/sql_top.asp
Related
I've been looking for hours on how to return a limited set of rows similar to SELECT TOP 100 * FROM CUSTOMERor SELECT * FROM CUSTOMER LIMIT 100 or SELECT * FROM CUSTOMER WHERE ROWNUM <= 100 and for the life of me I cannot find a way to do this with this particular database.
The database version is 10.1.46 and I've found documentation for a later version of SQLBase that says the Limit keyword is what should be used, but nothing has worked when attempting to limit the amount of rows returned using isql. SQL Prepare errors get thrown. I'm at a loss as to how to do this and I'm beginning to think the database just doesn't support limiting the amount of rows returned.
I'm hoping someone knows how I can limit the number of records returned.
As far as concerns, limit is implemented in Base SQL using session parameters:
SET LIMIT 100
SELECT * FROM CUSTOMER;
SET LIMIT OFF
Alternatively to 'LIMIT', you can use 'PERFORM' then 'FETCH' in SQLTalk:
PREPARE SELECT * from CUSTOMER ORDER BY <column1> DESC;
PERFORM;
FETCH 100;
or if you are using TeamDeveloper,
Simply:
SqlPrepareAndExecute( hSql, 'SELECT * from CUSTOMER ORDER BY <column1> DESC')
While nPtr < 101
Call SqlFetchNext(hSql,nReturn)
After v11.7 you can use the following syntax:
SELECT * FROM CUSTOMER LIMIT 100
p.s. If you need SQLBase manuals for any version v8 through v12.2 go here:
SQLBase Manuals ( all versions )
In Oracle PL/SQL I was used to write:
SELECT * FROM MY_TABLE WHERE ROWNUM <= 100;
in order to fetch only the first 100 records of the table named MY_TABLE.
What could be the equivalent SELECT statement in SQL SERVER?
In SQL-Server You can Use TOP to select the no. of rows.
SELECT TOP 100 * FROM MY_TABLE
select top 100 * from tbl
column name is required or use *
SELECT TOP 100 * FROM TABLE
You can also filter rows by using where class
SELECT TOP 100 * FROM YOURTABLE WHERE YOURCONDITION
In SQL Server 2012, you can use OFFSET and FETCH to determine which rows to return. They're documented under ORDER BY; This makes sense since asking for 100 rows, when tables are by definition unordered, gives unpredictable results.
Similarly, if you use other's answers, re: TOP, you should also have an ORDER BY clause, or else it's not defined which rows will be returned.
SELECT TOP 100 * FROM MY_TABLE
Sorry if I misunderstood.
Edit: Must be faster
I am a beginner with SQL and I'm following the tutorial at W3 Schools SQL Exercises. I tried to run the following query but I am getting error:
SELECT * FROM Customers LIMIT 5, 5
ERROR:
Syntax error in FROM clause.
Your problem is that you are using MySql syntax instead of SqlServer syntax.
You should use:
SELECT TOP 5 * FROM Customers
If you're following the example in the link you provided...
We will use the Customers table in the Northwind database:
Northwind is a sample database in MS SQL products. And MS SQL does not have support using LIMIT queries. So that website is probably using some version of that RDBMS.
Try running:
SELECT TOP 5 * FROM customers;
This gets you the first 5 records in the result set (unordered). It does not skip any records, though, as your LIMIT 5, 5 clause would have.
You can see that they use ADODB, so you should use TOP clause:
SELECT TOP 5 * FROM Customers
I suspect you need to use offset:
select * from Customers limit 5 offset 5;
Not all RDBMSs support the limit m,n syntax (I believe MySQL does, but PostgreSQL doesn't). Also, you'll probably want to use an order by clause to help ensure that you get consistent results with your query (because databases, in general, don't care about the order of rows or columns unless you specify):
select * from Customers order by col limit 5 offset 5;
I had the same problem. You can use rownum:
select * from Customers where rownum < 6;
I'm trying to get my page listing function working in ASP with an Access database, but I don't know the alternative to LIMIT in Microsoft SQL. I have tried TOP but this doesn't seem to be working.
Here is the statement am using with MySQL:
SELECT * FROM customers ORDER BY customerName DESC LIMIT 0, 5
How can I convert this to work with Access Database?
According to ms-access view:
SELECT TOP(5) * FROM customers ORDER BY customerName;
will fetch an error "The SELECT statement includes a reserved word",
the correct syntax is:
SELECT TOP 5 * FROM customers ORDER BY customerName;
(note the brackets)..
Top(5) is deceptive. Internally the database returns all records, then Access just shows the Top 5 rows. I'd use the LIMIT keyword instead of Top(n).
There is no direct equivalent in access for LIMIT, but the TOP statement can be manipulated into working in a similar fashion to say, "... LIMIT BY 50, 250" etc,. I found out by experiment that if you wanted to get the "next 50" records at an offset of 250 you could try the following
SELECT * FROM (SELECT TOP 50 tab2.* FROM (SELECT TOP 300 tab1.* FROM my_table AS tab1 ORDER BY column_name ASC) AS tab2 ORDER BY column_name DESC) ORDER BY column_name ASC;
This should return the records from row 250 to 300, in ascending order (provided they exist.) with or without a unique index. A WHERE clause could tidy the results further if need be.
A little convoluted but I hope it helps.
Is there a way to only show the first N lines of output from an SQL query? Bonus points, if the query stops running once the N lines are outputted.
I am most interested in finding something which works in Oracle.
It would be helpful if you specify what database you are targetting. Different databases have different syntax and techniques to achieve this:
For example in Oracle you can ahieve this by putting condition on RowNum (select ... from ... where ... rownum < 11 -> would result in outputting first 10 records)
In MySQL you can use you can use limit clause.
Microsoft SQL Server => SELECT TOP 10 column FROM table
PostgreSQL and MySQL => SELECT column FROM table LIMIT 10
Oracle => select * from (SELECT column FROM table ) WHERE ROWNUM <= 10 (thanks to stili)
Sybase => SET rowcount 10 SELECT column FROM table
Firebird => SELECT FIRST 10 column FROM table
NOTE: Modern ORM tools such as Hibernate give high level API (Query, Restriction, Condition interfaces) that abstract the logic of top n rows based on the dialect you choose.
For Oracle the suggested and accepted solution is wrong. Try using an order clause, and the results will be unpredictable. The SQL will need to be nested to accomplish this in Oracle.
select name, price
from (
select name, price, row_number() over (order by price) r
from items
)
where r between 1 and 5;
The example above was borrowed from http://www.adp-gmbh.ch/ora/sql/examples/first_rows.html which has a good discussion on this topic.
I know it with MySQL but I don't know if it's standard SQL :
end you Query with 'limit X', X = n. of lines you want to get.
Example :
SELECT NAME FROM EMPLOYEES ORDER BY SALARY DESC LIMIT 10;
For Oracle, you can try this
select /*+ FIRST_ROWS(10) */ * from table;