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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2
votes
3answers
137 views

Performance difference between searching table with 350 columns and searching table with 25 columns

I am currently doing some hibernate performance test. My requirement is to search for data in a particular column of a table containing 8 million rows and 350 columns. Currently, I don't have the ...
1
vote
2answers
66 views

Practical way to temporarily shut down a database

What would be the most practical way to shut down a database to access for any user? I need to practically shut down a specific database on a SQL Server for test purposes, and would like to know the ...
1
vote
1answer
235 views

Polling for new records in a table

We have a table that is append+read only. We'd like to have multiple applications consume all new rows that show up in that database, in a cheap and easy way (without change tracking). The simple ...
1
vote
1answer
111 views

Unable to generate a MySQL query

I have a table in a MySQL database as below: ID Timestamp State 1 2013-07-10 09:00:00 Good 1 2013-07-10 09:10:00 Good 1 2013-07-10 09:20:00 Good 1 2013-07-10 09:30:00 Bad 1 ...
1
vote
1answer
323 views

Inserting filtered data from one table to another

I need to find the number of employees who are not in all departments. I have one more table T2 in which same department column is present. Now I want to insert only those values of department which ...
2
votes
1answer
418 views

Longest prefix search in Oracle

I have a list of phone number prefixes defined for large number of zones (in query defined by gvcode and cgi). I need to efficiently find a longest prefix that matches given number PHONE_NR. I use ...
-1
votes
1answer
563 views

dead lock when updating [closed]

Update Operation.TrTable Set RecordId = RecordTABLE.newRecordId From Operation.TrTable tr Inner Join ( SELECT r.Id AS newRecordId, r.KeyM AS MappingKey From ...
-1
votes
1answer
59 views

What could I possibly be doing wrong with this update statement

UPDATE pcdbak SET pcdbak.Title = pcd.Title FROM pcd, pcdbak WHERE pcdbak.eCommNum = pcd.eCommNum This was the error message: [Err] 1064 - You have an error in your ...
1
vote
1answer
50 views

Getting related data from an uncertain column

I am working on a friendship logic, the table friendship has this structure: `friendship_id` INT NOT NULL , `user1_id` INT NOT NULL , `user2_id` INT NOT NULL , `status` INT NULL , `created` ...
2
votes
2answers
8k views

Get username and/or IP address responsible for a query

I use the following query to find performance improvements in queries: SELECT TOP 20 SUBSTRING(qt.text, (qs.statement_start_offset/2)+1, ((CASE qs.statement_end_offset WHEN -1 THEN ...
9
votes
0answers
4k views

Fast SQL query with * but extremely slow with specific columns? [closed]

We have a query that we're running on SQL Server 2008 in the Management Studio. I can't give the exact query details, but let's say it's equivalent to this: SELECT * FROM MyView a (nolock) INNER ...
5
votes
1answer
486 views

How can a fill factor of 0 or 100 be the same?

As of my understanding, Fill factor of 80 implies that 20 percentage of each leaf-level page will be empty to enable future growth. I can't correlate how fill factor of 0 and 100 can be the same! Am I ...
2
votes
4answers
924 views

When do I use another type index than integer? (eg string) [integer vs string index]

I was reading about relational databases like sqlite and I always see the schema for user storage like: UserID (index) | Username | Password but wouldn't it be actually much faster to use Username ...
3
votes
1answer
379 views

Cumulative Game Score SQL

I have developed a game recently and the database is running on MSSQL. Here is my database structure Table : Player PlayerID uniqueIdentifier (PK) PlayerName nvarchar Table : GameResult ID ...
8
votes
1answer
942 views

IO_STALL question and understanding

I am collecting IO_STALLS from sys.dm_io_virtual_file_stats every 5minutes and then doing a delta to see which files are being affected most by IO. In one 5min period I get a delta of 5826331 ms ...
13
votes
7answers
23k views

Get the rank of a user in a score table

I have a very simple MySQL table where I save highscores. It looks like that: Id Name Score So far so good. The question is: How do I get what's a users rank? For example, I have a users ...
1
vote
2answers
140 views

Most efficient way to perform table operations (spec. drop) on tables having table names that match a certain criteria

I am performing a schema dump of certain tables. This accompanied by dropping the tables that will be dumped. For example I need to drop all tables that start with, let's say, "SRC_". You guys think ...
-4
votes
2answers
191 views

Inserting images in database [closed]

How can the images be inserted in a table? Var binary is not working in structured query language command prompt,what can be the syntax?
0
votes
1answer
348 views

RTF to Plain-Text? [closed]

Did you ever get the library from this post? We have a need to convert whole, large, whole tables worth of RTF information into something usable and would rather not reinvent if possible. Converting ...
0
votes
0answers
56 views

Problem merging two tables and store the result into another table in MySql Database

I have two tables store_timing and business_news. Both the tables are having more than 12,00,000 records. Now I want to merge all the data from these two tables WHERE store_timing.zipcode = ...
4
votes
1answer
263 views

What is the name of this type of query, and what is an efficient example?

The purpose is to find a parent, given it's children. For example, say you have a marketing package (aka a "combo"), and want to match it based on the products in it. Example table/data: create table ...
1
vote
1answer
108 views

InnoDB query duration inconsistent

I am running a series of UPDATE commands on a nearly empty InnoDB table, and around 1 out of every 20-30 queries will inexplicably take 10 times as long as the others. For example, the first 20 ...
3
votes
1answer
376 views

Splitting a table based on enum value

I am re-designing our company database, and am wondering whether or not to split this table up into two (or even three) different tables based on the type field. Prospects can become clients, and in ...
-6
votes
1answer
6k views

Using inner join to get data from multiple tables [closed]

I have 5 tables: A(a_id, a1, a2); B(b_id, b1, b2, a_id); C(c_id, c1, c2, b_id); D(d_id, d1, b_id); E(e_id, e1, e2, d_id); table b have a_id match with table a(a_id). table c have b_id match ...
2
votes
1answer
116 views

Zero conversion in sql

Char convertion in Oracle have a pattern: to_char(number,'pattern') and provide option "s" to take sign to result, for ex: select to_char(10,'S999') from dual; will return +10, but when i check select ...
0
votes
2answers
2k views

Difference between chained and migrated rows

What is the difference between chained and migrated rows? Also what query should be used to display these rows? (I'm using Oracle 11gR2 database)
3
votes
1answer
3k views

Postgres PgAdmin III Query Builder crash

I've been using Postgres and pgAdmin III for some years, but this morning I had a very BIG BIG problem. I'm using pgAdmin III 9.0 on Windows Xp operating system, on my laptop Dell Latitude E4300. ...
-4
votes
0answers
90 views

Multi-row INSERT rejected? [closed]

What's wrong with my query? :( USE tempdb; IF OBJECT_ID('dbo.OrderTotals', 'V') IS NOT NULL DROP VIEW dbo.OrderTotals; IF OBJECT_ID('dbo.OrderDetails', 'U') IS NOT NULL DROP TABLE dbo.OrderDetails; ...
2
votes
1answer
758 views

Is it possible to reduce a group to a row based on some criteria?

I'd like to perform a select on a table involving a GROUP BY such that all rows that share the same set of identifiers are grouped together, but I want to reduce the group to one of the grouped rows ...
-1
votes
0answers
399 views

Synchronising SQL tables in two locations [closed]

We have a bit of a conundrum at the moment. ANSI SQL solutions please. We have two databases located at two different geographic locations and will be using the web for all traffic between the two ...
5
votes
2answers
266 views

One table used in two databases

I have a common product table in db1 and db2. I want to make it one table because it has one inventory (stock of products). What is the best solution to share product table among two different ...
0
votes
1answer
155 views

Update column value in entire database [closed]

In my database, I have around 30 tables, each with an emp_number (INT) column. How can I update the value of emp_number in all 30 tables?
2
votes
2answers
247 views

Changing ORDER BY direction causes performance issue

I use MySQL 5.6, and I have two tables each with 16M rows: CREATE TABLE IF NOT EXISTS `newsstudios` ( `id` int(11) NOT NULL AUTO_INCREMENT, `title` varchar(255) COLLATE utf8_unicode_ci NOT NULL, ...
-1
votes
1answer
64 views

How do I create a trigger that cascades new rows into another table?

I am having a table name link with two columns link1 and link2 and another table name hide with four columns hide1, link1,link2 and hide2. If i insert data into link table the data should insert into ...
7
votes
2answers
1k views

How to find parent rows that have indentical sets of child rows?

Suppose I have structure like this: Recipes Table: RecipeID Name Description RecipeIngredients Table: RecipeID IngredientID Quantity UOM What are some good ways for ...
-1
votes
1answer
112 views

No predicate warning [closed]

I am getting a No predicate warning on this query. Can someone help? SELECT DISTINCT TOP 100 T0.nsid, T0.id, T0.version, ...
1
vote
0answers
517 views

Creating view recursive query in Oracle DB results in ORA-00600 (ORA-600)

Hello Ladies and Gents, I've been trying to deploy a recursive query as a view in Oracle XE and Standard Edition, neither to much success. The query is located in this question here: ...
-1
votes
2answers
9k views

Query to search for a substring in xml

I use below query to search for a substring in whole xml(including node name and node value) SELECT * FROM tablename WHERE ( Charindex('abc',CAST([xmlcolumn] AS VARCHAR(MAX)))>0 ) I want an ...
4
votes
2answers
661 views

Multiple JOIN of 6 tables via 5 database instances

I'm currently reengineering my corporates user management and created a table which lists all users of all the 5 database instances. Next step is, that I need to write a query which shows me all the ...
0
votes
1answer
472 views

Does this error message indicate a SQL injection vulnerability?

I just took over management for a webservice and today I got a user report about this error. Now I'm no sql injection expert but does this error make this attack possible? Microsoft OLE DB Provider ...
0
votes
0answers
51 views

Any recommendation on tuning following query

My query has lot of select statements and unions. I think it is querying database multiple times and combining data. Is there a way we can eliminate multiple passes to the database? I would like to ...
2
votes
1answer
1k views

The job failed. The owner (pc\user) of job FULL DB BACKUP does not have server access

SQL Server 2008R2 is failing to execute log backup hourly. Date 5/2/2013 10:22:19 PM Log Job History (LOG BACKUP) Step ID 0 Server pc Job Name LOG BACKUP Step ...
2
votes
1answer
10k views

MySQL Insert into table, where name = id, if not exist, then insert name and use that ID

I am producing a MySQL database that will store results for a particular sport. I have a table containing people, (PERSONID, FIRSTNAME, LASTNAME), another table containing animals names (ANIMALID, ...
1
vote
2answers
426 views

Is it possible to build an UNDO framework for postgres?

I was thinking of a table which would automatically log all transactions made to other tables and the command to undo that modifications. So every time you issue an UNDO() command you would read the ...
6
votes
2answers
2k views

tempdb logs on same drive as tempdb data or with other logs? [duplicate]

For many reasons I only have 3 hard drives (RAIDed and in an Always-On AG) for all my database files: D: Data E: Logs F: Tempdb Should the tempdb log file go on F: with the data file(s) or on E:? ...
0
votes
1answer
60 views

Wrong return results

I'm trying to grab all the rows that have a risk of critical or high, with the discription or synopsis or solution or cve like password. But it keeps showing all rows not just rows with a risk of ...
-3
votes
1answer
132 views

What will the sql statement “DELETE FROM sales” do?

DELETE FROM sales; And if there are no other uncommitted transactions on the sales table. Which statement is true about the DELETE statement? It removes all the rows in the table and deleted rows ...
0
votes
1answer
322 views

How to profile a particularly slow or inefficient query

I'm currently writing queries for my database but this is the first time I've dealt with large data sets of any sort, and I'm now finding that I need to improve the performance of my queries. ...
1
vote
1answer
230 views

Relative cost of two similar queries involving XML columns

I have two queries as shown below which do the same thing. Here xmlcolumn is a column with datatype XML. I use these queries to search for a string anywhere in the XML column. I checked the execution ...
3
votes
2answers
1k views

How can I create different sets of sequential values based on another column in a table?

I've got a table that holds two types of notes. Collection Notes and Delivery Notes. They are identical data structures, hence using the same table. CREATE TABLE Notes ( Id int IDENTITY(1,1) NOT ...