Structured Query Language (SQL). For questions about the language, not Microsoft SQL Server (tag sql-server).

learn more… | top users | synonyms (2)

4
votes
2answers
6k views

How to monitor SQL Server data and log file growth?

I'm trying to find a way to monitor data and log file size from SQL Server databases (within an SQL Server instance). I would not want to use third party tools, but simply pure SQL or PowerShell. I ...
1
vote
1answer
2k views

When to open your MySQL cursor

A relatively simple question but from all my research I have been unable to find a decent answer. Which is technically more correct, open your cursor after your handlers have been defined or before ...
6
votes
1answer
2k views

SQL 2008 R2 - Odd timeout issues

I'm having some recent timeout issues in our SQL 2008 R2 server. This started occurring late last week and has since somewhat improved. Issues: When using SSMS and right clicking over a database......
6
votes
2answers
9k views

How to check when statistics was last executed?

We've been having a number of issues with our indexes lately which our DBA team has attributed to statistics not having been run recently. This has made me wonder - how can I check if statistics have ...
2
votes
1answer
921 views

How to serialize a record / row in SQL?

Is there a way to serialize a record/row in SQL? And conversely, to deserialize something that has been serialized. By serialize, I mean put all of the fields in a record into one field or string. ...
4
votes
1answer
139 views

Filtered indices: Why include the filtered-on field?

This just drives me mad. Consider a simple table with irrelevant columns removed: create table boxes ( row_id int not null identity(1,1) primary key, location varchar(15) null, dismantled bit ...
5
votes
3answers
4k views

How do I use `sys.dm_exec_connections` in combination with SUSER_SNAME()?

How do I use sys.dm_exec_connections in combination with SUSER_SNAME()? I want to see the username corresponding to each record in sys.dm_exec_connections.
2
votes
3answers
137 views

transaction log after restore

Can you let me know why a transaction log would be a lot smaller in size after restoring from a full backup. Currently we have a massive log file on the live server, but after a restore to a test / ...
2
votes
1answer
4k views

SQL Server Maintenance Plan Fails to Rebuild the Indexes

When I run a maintenance plan to reorganize and rebuild tables indexes, it fails. Below the last two rows that displays the fail: Source: Reorganize Index Executing query "ALTER INDEX [...
2
votes
1answer
2k views

Tracing/Logging of Sybase ASA

Trying to get logging/tracing of Sybase 9.0.2.3396 (Adaptive Server Anywhere). I wish to log all the SQL executed against the database. I tried RIBO and while I got it "working," I never saw anything ...
2
votes
2answers
16k views

ORA-20000: ORU-10027: buffer overflow, limit of 10000 bytes

I got that error when I tried to execute this query: select * from lc_history2 lc where lc.view_name <> 'LC Main' and lc.modifiedtime = (select max(modifiedtime) from lc_history2 l where lc.lc ...
2
votes
1answer
3k views

Database restoring taking too long

I have backuped sql database from my server and tried restore on my machine. Restoring window disappeared by saying successfully restored. In the database list my database is not accessible. ...
4
votes
2answers
647 views

Getting to know SQL via the “short questions/simple answers style of learning”

Looking for a incremental SQL course that would likely be similar to the this Ruby Koan course; which is in fact inspired by the book, "The Little Lisper", which uses a short questions/simple answers ...
0
votes
1answer
218 views

I want to be databse specialist (SQL) [closed]

Hello there database specialists, I have Bachelor degree and one part of study was database, where I learned about database design, SQL language... and I'm working with mysql, but I decided to be ...
0
votes
1answer
1k views

SET keyword in SQL Server

I have been using SET keyword to assign the values to parameters declared in SQL Server something like, Declare @StudentName Nvarchar(max) SET @StudentName='ABC' I'm not sure how to write this if ...
17
votes
5answers
286 views

Enforcing database integrity

Would this ever make sense to have application enforce the database integrity instead of having foreign keys, check constraints, etc? How much of a performance improvement one can expect for not ...
2
votes
2answers
188 views

Validation of availability for a new order

I have a management application of sales, stock and payment on a warehouse whole saler from a web interface. In particular, when a order is effectuated it must create a line corresponding to each ...
1
vote
1answer
122 views

SQL Server function invocation syntax question

The following excerpt is extract from this page. CURRENT_USER (Transact-SQL) Returns the name of the current user. This function is equivalent to USER_NAME(). When I execute the two ...
6
votes
2answers
1k views

Why did Microsoft kill “English Query” on SQL Server?

Given the popularity of the natural language user interface Siri, which was acquired by Apple for $200 million, I've wondered if anyone knows why Microsoft killed "English Query" on SQL Server.
-3
votes
1answer
2k views

Best practices for finding and updating a handful of records?

Seems like a simple question, but wondering what is the "best" way to do this if you were "dotting your i's and crossing your t's".
10
votes
2answers
17k views

What does the term “projection” refer to in an SQL query (or view definition)

In Oracle's document The Query Optimizer, under View Merging, I found the following information The view merging optimization applies to views that contain only selections, projections, and ...
4
votes
1answer
15k views

Invalid use of a side-effecting operator 'INSERT' within a function - Multiple Inserts in Function

If this is not the right forum please let me know and move it for me. I've just got a bunch of inserts like this toward the end of my scalar function: INSERT INTO [Raptor].[dbo].[UserRole] ...
2
votes
3answers
190 views

Document versioning

I want to store in SQL Server 2008 XML files, but in a way that versioning is supported. For example, I have a XML document and I save it in the DB(in the XML datatype column). After that, I edit it. ...
5
votes
2answers
1k views

Specify type on SQL Server Computed Column

I have just added a computed column to a table, and it is showing up as an int and I'd like to make it a bit is this possible? I'm having a hard time finding any info on this. Below is the computed ...
7
votes
2answers
1k views

Window functions cause awful execution plan when called from a view with external parametrized 'where' clause

I had this issue long time ago, I found a workaround which suited me and forgot about it. But now there's that question on SO so I'm willing to bring this problem up. There's a view that joins few ...
2
votes
2answers
1k views

Postgres Index scan forward vs backward = speed difference of 357X slower

PostgreSQL 9.1.2 on x86_64-unknown-linux-gnu, compiled by gcc (GCC) 4.1.2 20080704 (Red Hat 4.1.2-51), 64-bit Dedicated DB server 4GB ram Shared_Buffers = 1 GB Effective_cache_size = 3GB Work_mem = ...
5
votes
3answers
34k views

Login to SQL Server using Windows Authentication

I have an (.Net Console App) EXE which connects to various SQL databases using SQL server Authentication with appropriate credentials. Now there is change required in the EXE to use windows ...
-1
votes
2answers
2k views

Multiple child tables

I would like to know what is the best solution for making a parent table with multiple children? I have to make multiple children table. One for each profile. Is there a better idea than having 3 ...
0
votes
1answer
109 views

Redundant / partially duplicated data in a DB - how to structure?

I'm building a website for which a large amount of user generated data will be stored in a back end db and will be discoverable by all users. By its nature, a portion of the user entries will be ...
8
votes
2answers
22k views

How do I find an object that doesn't seem to exist in the objects table?

I have an object called cot_ntn_pi_v. I was told this was a synonym. It doesn't appear in the all_synonyms table. It looks like a view or table but I can't find it in the all objects table. I can ...
2
votes
3answers
499 views

Express union which is dependent on other results

I would like to make a union of two tables that are actually in a hierarchical constellation. How would I write that in relational algebra? Say table A is the parent of B in a 1:n relationship. ...
1
vote
2answers
2k views

How to add ansi null and ansi warning in connection string

Using RDO Connection Connection String Set RdoVisPay = rdoVISENV.OpenConnection("VISA", 1, False, "DSN=VISA;UID=sa;PWD=sa;APP=Visual Basic;WSID=" & ServerName & ";DATABASE=" & Database1)...
7
votes
6answers
10k views

Maximum value from multiple tables

Consider the following situation: we have T1, T2, & T3 tables in which saved id and price of products. Now we need to find the id of products which have maximum price of all 3 tables. I have this ...
2
votes
4answers
658 views

What computations can NOT be performed in standard SQL?

I know loops cannot be expressed in standard SQL. What other forms of processing can it not perform?
2
votes
1answer
352 views

Okcupid.com (can find matches without accessing a database!?) [closed]

I'm doing a research project on a popular dating site called: OkCupid I would like to talk about how the database is used. After reading this explanation from the Co-Founder of the site, I became very ...
7
votes
1answer
717 views

Adding SPARSE made table much bigger

I have a generic log table, about 5m rows. There's a "strongly typed" field that stores event type, and a bunch of "losely typed" columns that contain data relevant to the event. That is, meaning of ...
0
votes
1answer
73 views

Replicating Results of Queries on Oracle

I wan to setup a database such that its data come from queries run on a remote database. Basically the source database is very slow and we have no control over it. So, I want to create a second ...
2
votes
1answer
2k views

Oracle SQL count occurances of character in VARCHAR

Is is possible to count the number of occurrences of a character in a VARCHAR in oracle? Something that would allow me to determine '11001110' has 5 ones?
1
vote
1answer
229 views

Change tracking SQL Server 2008

My requirement is to track old rows and modified rows from some particular table and the time when changes are made. Using "Change Tracking" and with help of any system table. Due to some specific ...
2
votes
1answer
207 views

SQL from/where or join?

I was wondering performance wise what would be faster a join or a from and where query. I am trying merge and update query but performance is terrible?
3
votes
2answers
95 views

FK on NON Primary Keys

Is there any performance problem / difference if I have one Foreign Key that points to another table Indexed Fields that is NOT the PK ? Something like DECLARE @T1 TABLE ( T1_ID INT ...
2
votes
1answer
814 views

T-SQL, show a set of rows (specific column) as a field, for a better desc, please see the table relationship

I have been having a problem for quite a while now, that I can show with a sample of 5 tables (I'm actually dealing with more than 5!): -------------------------------- shipments ...
14
votes
2answers
9k views

Create View in specified database with dynamic sql?

I am writting a dynamic sql to drop and create view in different database. So I wrote: set @CreateViewStatement = ' USE ['+ @DB +']; CREATE VIEW [dbo]...
6
votes
2answers
4k views

Does SQL Server have a Date_Format function?

All I found is a list of predefined DateFormat that I can choose from, like this As I remember in MySQL (and PostgeSQL too?) you can define your Date Format: DATE_FORMAT(now(),'&m_%Y') --for ...
1
vote
1answer
54 views

Database partition efficiency

Let's assume that you have a table that partitions on CATEGORY and SUBCATEGORY. Also assume that every subcategory can be mapped to a category, i.e. subcategory are proper subsets of categories. Let'...
3
votes
2answers
2k views

How can I optimize performance on a MySQL ndbcluster?

So, this is what I have: A simple table classes__to_students: |class |student| --------------- Math Alice Math Bob Math Peter Math Anne Music Bob Music Chis Music ...
5
votes
2answers
3k views

The order of INNER JOIN's

I would like to know if there are any rules about the order of INNER JOIN's in T-SQL 2000. I had 62x the performance on my query when my INNER JOIN that act like a filter is placed at first instead ...
1
vote
1answer
3k views

Copy blob from one row to another

I have a corrupt blob in a row. I'd like to replace that with another blob from the same table. How can I do that with sql statements only? (No file system access if at all possible.)