473,473 Members | 1,861 Online
Bytes | Software Development & Data Engineering Community
Create Post

Home Posts Topics Members FAQ

Speed up Select distinct

What is the best way to speed up query looks like:

SELECT DISTINCT COLUMN1, COLUMN2, COLUMN3, COLUMN4 FROM TABLE WHERE COLUMN5
= 5

cardinality of Column5 = 10
will create bitmap index o n column5 help to speed up above query??
Jun 27 '08 #1
0 2313

This thread has been closed and replies have been disabled. Please start a new discussion.

Similar topics

5
by: Martin Feuersteiner | last post by:
Dear Group I'm having trouble with the clause below. I would like to select only records with a distinct TransactionDate but somehow it still lists duplicates. I need to select the...
3
by: Jay | last post by:
I have a table with a varchar(255) column, it has 111,000 rows. When I do a select distinct on that column it takes 16 seconds and returns about 25 distinct values, I'd like it to take much less...
2
by: mfyahya | last post by:
I have two tables, both containing an 'authors' column. Is there a way to get a unique list of authors from the two tables? I tried SELECT DISTINCT `authors` from `table1`, `table2`; but I got an...
3
by: Tcs | last post by:
My backend is DB2 on our AS/400. While I do HAVE DB2 PE for my PC, I haven't loaded it yet. I'm still using MS Access. And no, I don't believe this is an Access question. (But who knows? I...
0
by: Bob Quintal | last post by:
Hi all, Using Access 97 Front End, linked to SQL Server back end. Required data is spread across three tables, with one table linked one to many to the two others. I created a report based on...
6
by: lesperancer | last post by:
SELECT distinct b.t_orno, b.t_pono FROM tblMonthlyBooking AS b, tblFilterDate, tblFilterDate AS tblFilterDate_1 WHERE (((b.t_yearMonth) Between . And .)); tblMonthlyBooking is a sql server...
6
by: Bob Stearns | last post by:
I am getting unwanted duplicate rows in my result set, so I added the DISTINCT keyword to my outermost SELECT. My working query then returned the following message: DB2 SQL error: SQLCODE: -214,...
5
by: Daniel Wetzler | last post by:
Dear MSSQL experts, I use MSSQL 2000 and encountered a strange problem wqhile I tried to use a select into statement . If I perform the command command below I get only one dataset which has...
27
by: SQL Learner | last post by:
Hi all, I have an Access db with two large tables - 3,100,000 (tblA) and 7,000 (tblB) records. I created a select query using Inner Join by partial matching two fields (X from tblA and Y from...
0
marktang
by: marktang | last post by:
ONU (Optical Network Unit) is one of the key components for providing high-speed Internet services. Its primary function is to act as an endpoint device located at the user's premises. However,...
0
by: Hystou | last post by:
Most computers default to English, but sometimes we require a different language, especially when relocating. Forgot to request a specific language before your computer shipped? No problem! You can...
0
jinu1996
by: jinu1996 | last post by:
In today's digital age, having a compelling online presence is paramount for businesses aiming to thrive in a competitive landscape. At the heart of this digital strategy lies an intricately woven...
1
by: Hystou | last post by:
Overview: Windows 11 and 10 have less user interface control over operating system update behaviour than previous versions of Windows. In Windows 11 and 10, there is no way to turn off the Windows...
0
tracyyun
by: tracyyun | last post by:
Dear forum friends, With the development of smart home technology, a variety of wireless communication protocols have appeared on the market, such as Zigbee, Z-Wave, Wi-Fi, Bluetooth, etc. Each...
0
agi2029
by: agi2029 | last post by:
Let's talk about the concept of autonomous AI software engineers and no-code agents. These AIs are designed to manage the entire lifecycle of a software development project—planning, coding, testing,...
1
isladogs
by: isladogs | last post by:
The next Access Europe User Group meeting will be on Wednesday 1 May 2024 starting at 18:00 UK time (6PM UTC+1) and finishing by 19:30 (7.30PM). In this session, we are pleased to welcome a new...
0
by: TSSRALBI | last post by:
Hello I'm a network technician in training and I need your help. I am currently learning how to create and manage the different types of VPNs and I have a question about LAN-to-LAN VPNs. The...
0
by: 6302768590 | last post by:
Hai team i want code for transfer the data from one system to another through IP address by using C# our system has to for every 5mins then we have to update the data what the data is updated ...

By using Bytes.com and it's services, you agree to our Privacy Policy and Terms of Use.

To disable or enable advertisements and analytics tracking please visit the manage ads & tracking page.