DO NOT USE this for questions targeting Microsoft SQL Server, use the tag sql-server instead. "SQL" is an acronym for "Structured Query Language", it is used in relational database management systems (RDBMS) to query, update, delete, and insert data as well as modify the structure of the database. ...

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5
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2answers
5k views

Correct way to design a shopping cart websites database

I am in a web applications course. My instructor really didn't like the layout of my database, saying it was incorrect in pretty much every way. Fast forward 2 months when I'm remaking the website in ...
1
vote
1answer
100 views

T-SQL Case functionality

Is it possible to structure a CASE statement as follows? For each Path column I want to update the Value column, but the values aren't being set and I'm not sure how to proceed. The columns are all ...
4
votes
1answer
846 views

Removing duplicates from a query with conditions in Access 2007

I have a table of transactions with 880,095 records that I am querying. There are duplicate Transaction ID's in the table that I would like hidden/removed when querying the table. Eg 1. ...
0
votes
1answer
178 views

How to number SQL results sequentially?

Given following query - SELECT name, age FROM students WHERE age > 22 The result is - name age ---- --- Kshitiz 23 Steve 22 Paul 24 How can I number the results sequentially? Like ...
4
votes
1answer
372 views

Large Transaction Log Backups in Service Broker-enabled system

We have a system that uses Service Broker for asynchronous messaging, with a fairly high throughput of messages. We don't really care about the persistent features of SSB in this scenario -- the ...
14
votes
5answers
2k views

Sequential GUID or bigint for 'huge' database table PK

I know this type of question comes up a lot, but I've yet to read any compelling arguments to help me make this decision. Please bear with me! I have a huge database - it grows by about 10,000,000 ...
1
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1answer
698 views

Restore .mdf data file for a File Group in SQL Server

I have a database with three filegroups and each filegroup hosting one datafile. One of the secondary filegroups XYZ with data file xyz.ndf got updated with wrong/bad information in various tables ...
1
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2answers
2k views

Changing field length when foreign keys reference primary key field in table

I have a situation where a number of foreign keys are referencing a column in Table "A". I would like to change the length of the column in table "A". What is the best way to accomplish this in SQL ...
0
votes
0answers
30 views

Max connections sql server express could have? [duplicate]

Possible Duplicate: Max connections SQL Server Express could have? I have sql server 2005 express edition installed on one of my client's machine, and lots of other users are also connected ...
5
votes
2answers
930 views

Deleting duplicate records when using text datatype

I have a large (~678,000 rows) table storing emails, and I need to delete duplicate records that match the fields of the email: to, from, subject, body, as well as the foreign key record_id. Normally ...
5
votes
3answers
1k views

“AT TIME ZONE” with zone name PostgreSQL bug?

I was answering this stackoverflow question and found strange result: select * from pg_timezone_names where name = 'Europe/Berlin' ; name | abbrev | utc_offset | is_dst ...
2
votes
3answers
5k views

Which SQL Server Express edition is right for me?

I have developed a Java program which works with SQL Server as it's database. I have installed SQL Server 2012 Enterprise edition on my Windows and designed the database via SQL Server Management ...
3
votes
2answers
260 views

Inner Join or direct data save in SQL Server

I am developing a social network site and expecting very good response from people so expecting huge users (maybe more than million in years). My website is holding user information table and all its ...
2
votes
3answers
633 views

How to select data in a sub query only once?

I have the following query: SELECT ordno from orders where ordno NOT IN (SELECT ordno FROM invoices) There are about 25000 records in each table. I have indexed the ordno column. The query ...
4
votes
2answers
2k views

How do you set the pagesize, codeset and table space when creating a database in DB2?

I want to create a database in DB2. I found some information on this page I want to use only some options which are explained on the page: PAGESIZE CODESET TABLESPACE Then, I want to ...
-1
votes
2answers
404 views

Oracle SQL Query/SubQuery Single column with mutilple data [closed]

Id File-Name Descrption 1 yyyy Started 2 yyyy incompleted 3 rrrr Started 4 tttt started 5 uuuu started 6 rrrr completed 7 tttt completed 8 uuuu ...
3
votes
1answer
82 views

a query that shows the load request received through GPRS by salesman

I have mobile sales system, in which the salesman sends their stock request in handheld device and through GPRS the data comes to MS SQL database. I need o show a report that shows the which request ...
13
votes
2answers
369 views

Does firing off an indefinite WAITFOR increase the log file size?

In the last release of my app, I added a command that tells it to wait when something arrives in the Service Broker queue: WAITFOR (RECEIVE CONVERT(int, message_body) AS Message FROM MyQueue) The ...
0
votes
2answers
717 views

how to select * from XML where id=1?

declare @xml xml, declare @num int set @num = 1 set @xml = ' <row> <Id>1</Id> <name>reza</name> </row> <row> <Id>2</Id> ...
2
votes
1answer
9k views

Multiple “GROUP_CONCAT”s with WHERE clause

In a table as id name type info 1 BMW car yes 2 Reno car no 3 IBM electronics no 4 Sony electronics yes 5 Mazda ...
9
votes
1answer
4k views

Deadlock error isn't returning the deadlock SQL

Transaction (Process ID) was deadlocked on lock resources with another process and has been chosen as the deadlock victim. Rerun the transaction. I am getting this error randomly when one of my ...
5
votes
1answer
168 views

Practical application of EXISTS vs. LEFT JOIN to find addresses for delivery

Our end users have many ways of shipping product to our customers. They can use the customer address in one table ([customer]), a specific delivery address in another ([dropship]), or yet another ...
4
votes
1answer
452 views

database design issue

This is my first time on this beautiful content rich site. I have a sql server 2008 database, but am not too experienced with good relational database design. My project is this: I have a school ...
0
votes
2answers
748 views

How to mix pairs of rows without JOIN (in a temporary table)?

I have a TEMPORARY table containing pairs of key/value as id col1 col2 type pair 1 key1 key2 key 1 2 value1 value2 value 1 3 key3 ...
3
votes
2answers
188 views

Query taking too much time

My query is taking too much time to execute. Please help me here. mysql> explain select pcm.catalog_id from cat_produ_catal_map_defer pcm, cat_catal_catal_map_defer ccm, cat_catal_defer c ...
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vote
1answer
150 views

Transposing data

I have a table with 31 columns which contain values for each day in a month and I want to create a tranpose table like the example below. Real data in the database is really big so I don't expect to ...
3
votes
1answer
3k views

How to re-assign two variables in a conditional UPDATE

Consider a simple update as SET @var1 = 20; SET @var2 = 26; UPDATE table1 SET col1=IF(@var1>50, @var1 := @var1-col4, @var1 := @var1+col5), col2=IF(@var2>50, @var2 := @var2-col6, @var2); ...
3
votes
1answer
216 views

Bayesian ranking

I have the following table in my database: ╔════════╦═════════════╦═══════════════╗ ║ Name ║ total_stars ║ total_reviews ║ ╠════════╬═════════════╬═══════════════╣ ║ Item A ║ 27 ║ ...
4
votes
1answer
285 views

Specifying the node to connect in db2

I have 2 nodes in my db2 catalog. How would I include the node on which I want to connect inside the db2 connect paramters? Node 1 entry: Node name = DB2HOST1 Comment ...
7
votes
2answers
2k views

PAGE compression in SQL Server effect on running queries

I am planning to apply PAGE compression to some of the big tables in my database (DW to be precise). These tables are fairly big with over 15 Billion rows. When I applied the compression in test ...
3
votes
2answers
936 views

Restore a Database into a Current Database and merge

I want to know how, or if it is possible, to backup a database then should the user wish, restore that database at a later date and merge it with the one they are currently using. Both Databases will ...
3
votes
2answers
1k views

Shrinking SQL Server 2000 database

I apologize for the long question. I am trying to learn a lot on the fly as I have become the defacto SQL Admin. I have been tasked with moving a production database to a new server. My goal is to ...
0
votes
0answers
30 views

Shrinking SQL Server 2000 database [duplicate]

Possible Duplicate: Shrinking SQL Server 2000 database I have become the defacto SQL Server Admin and I have been tasked with moving a production database to a new server. I am trying to ...
3
votes
3answers
1k views

How to delete large amount of data from a sql table?

We ran out of disk space and we have a table with about 10million records. We'd like to delete the old records which are about 2million. What are the impact of just deleting these using a simple ...
1
vote
1answer
226 views

MapReduce performance on a single PC [closed]

I have heard that Hadoop has better performance than MySQL. Until now, I have used relational databases so this is really new technology for me. I have a 6 core PC. Suppose I have a table with 20 ...
3
votes
1answer
423 views

How to categorize rows by SUM of a column in mysql?

I have a table as id num_items folder 1 4 2 33 3 74 4 41 5 24 6 34 7 46 8 55 9 11 I want to assign folder number to rows but limiting the number of items in each folder (e.g. ...
4
votes
1answer
423 views

Why does WAITFOR (RECEIVE FROM QUEUE) show up in the monitor incorrectly?

I kick off the following command in my app: WAITFOR (RECEIVE CONVERT(int, message_body) AS Message FROM MyQueue) When I run `sp_who2 active', I get Status=SUSPENDED and Command=DELETE Note: ...
1
vote
0answers
337 views

big mysql database optimization

My Joomla mysql database has about 3.4 million rows in content table. It is just static article. Very slow and often use out of resources. To speed up it, I segmented it into 6 sub-tables and added ...
2
votes
2answers
485 views

Combining two similar SQL queries

I'm using the following SQL query twice with different values of limit. In my case, 40 and 100, though it doesn't really matter. My question is - can I combine these two queries into one query? It ...
0
votes
2answers
446 views

Merging multiple databases as separate schemas in PostgreSQL

I have to combine data from 4 different databases. Each having its own design. What i want to do is to Create a new database with my desired schema. and one schema per (to be merged) database Then ...
1
vote
1answer
106 views

How to aggregate datapoints in a table?

Suppose I have following table - CREATE TABLE data_points (t DATETIME PRIMARY KEY, value INTEGER); I want to aggregate the data by calculating average of every 10 points in the table. i.e. If ...
0
votes
1answer
2k views

How to UPDATE a column to SET previous row value to NULL cells?

I have a table as id value 1 music 2 3 movie 4 5 6 book 7 8 Some values are missing, and I want to assign the value of previous row to produce id value 1 music 2 music 3 movie 4 ...
0
votes
1answer
214 views

avoid insert xml duplicate data

how can to prevent duplicate inserts for every Execute? insert into IQ (XMLDT)values('<row>sdsdf</row>')
2
votes
2answers
526 views

Reordering data in a table

I have a table that stores sensor data (in SQLite) and looks like this; TABLE Timestream: idTimestream PK autoincrementing integer, time int not null, value float not null, idSensor integer not ...
3
votes
1answer
912 views

Profiler TextData output is null

I am doing a trace on a database and dumping the trace realtime into a table. The reason I'm doing a trace is I want to see all the queries that are being executed against the database. ...
2
votes
2answers
870 views

How to GROUP_CONCAT between given rows?

I have a table as id diary 1 breakfast 2 walk 3 start 4 office works 5 office projects 6 end 7 taxi 8 start 9 preparing for meeting 10 doing the meeting 11 end 12 night I want ...
1
vote
1answer
815 views

Splitting a column to normalized table

I have a de-normalized table as Original De-Normalized Table id text 23 first,second|third,fourth,fifth|sixth I want to normalize the database to create the following tables Table 1: (Split by ...
6
votes
1answer
858 views

ANSI/ISO plans for LIMIT standardization?

Are there currently plans to standardize one best way of limiting the number of results returned by a query? The stack overflow question at Is there an ANSI SQL alternative to the MYSQL LIMIT ...
5
votes
2answers
177 views

New Cluster Testing - Best Practice

We've finished setup of a 4-node SQL Server 2005 cluster. We are using Windows 2008 R2 as the underlying OS. We are looking for suggestions on a set of tests we could perform to test failover of the ...
3
votes
2answers
876 views

How to split a string to and get info from another table in mysql

I have a system to assign score for each sentence stored in a column: TABLE 1: word_scores word score this 3 is 4 a 5 test 1 another 0 sentence 8 TABLE 2: ...