An acronym for "Structured Query Language" (it's not the name of a specific DBMS product), SQL can be used in relational database management systems (RDBMS) to query, update, delete, and insert data as well as modify the structure of the database. It can also be used to manage schemas and data ...

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39 views

How to aggregate similar columns inside a very long table? [duplicate]

I have quite a difficult problem that I don't have any idea how to approach it. I'll be glad to receive some advice. I have a very long table which contains details about a specific house residents. ...
0
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2answers
45 views

“GROUP BY” in ranges?

Suppose I have a table with a numeric column (lets call it "score"). I'd like to generate a table of counts, that shows how many times scores appeared in each range. For example: score range | ...
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2answers
63 views

Msg 2627 Violation of PRIMARY KEY constraint

trying to make a database for teams in a tv show here. but when I try and insert data into tblShowteam the following error made its appearance. Msg 2627, Level 14, State 1, Line 2 Violation of ...
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0answers
14 views

Specific id to appear first in result of query [duplicate]

I have a sample query where: Select gID, entID, cID, gString From tblGF Where ((entID=$entID And cID=0) Or (entID=$entID And cID=$cID)) And (gFP='BB' Or gFP='CP' Or gFP='PS' Or gID=$gID) Order ...
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2answers
48 views

Time elapsed Calculation

I need to calculated time elapsed for each user to perform his part in a transaction. The sequence is: 0 -1 - B2 or 0-B3 The table looks like the following: ...
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0answers
24 views

Would an INNER JOIN query in a sharded relational database hit the same shard when using a compound primary key?

In this question I have asked about modulus calculation in sharded tables, this design is used: CREATE TABLE Orders (order_id INT PRIMARY KEY, ...); CREATE TABLE LineItems (order_id INT, lineitem_id ...
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0answers
16 views

Modulus calculation for compound primary keys in MySQL Cluster (and other sharded databases)

In MySQL Cluster, and generally in sharded databases, how is a compound primary key's modulus calculated? Say, for example, there are two tables that have primary keys like so: CREATE TABLE Orders ...
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0answers
23 views

Indexed column INSERT vs. UPDATE

I have an indexed column. I could give it a value on INSERT. But it would be easier if I would add this value via UPDATE later (I have to update this row anyway). But I was thinking if it would be ...
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1answer
83 views

Need help optimizing query to prevent full table scans

I have the following query, which while it works, is also doing a full scan on each left joined table (the log* tables). I thought by using a subquery in the FROM that this would eliminate the ...
0
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1answer
45 views

COUNT and GROUP BY performance

I have a table where I store visits (id, datetime, country, browser). I want to count how many visits are from which country. I use this query: SELECT country, COUNT(*) as hits FROM hits_table ...
0
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1answer
78 views

Join 3 tables returns too many results [closed]

I have 3 tables: users, posts, videos. The last 2 tables have user_id that associate with users.id (first table). The problem is that when I try to run inner join query and return all posts and ...
2
votes
1answer
89 views

Error Creating Foreign Key in Oracle

I have 2 tables: PRODUCTS PREFIX SUFFIX ATTR1 ATTR2 ----------------------------------------------------- 001 AAA 50 100 001 BBB 20 300 010 ...
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1answer
83 views

UPDATE not working properly with linked server

Please see a question I asked here earlier: http://stackoverflow.com/questions/24324823/update-not-working-properly-with-linked-server Dommer suggested using OPENQUERY and this does appear to resolve ...
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2answers
118 views

how to solve slow running sub query TSQL

I have a problem with a slow running query. I have analysed the query with the sql server profiler but I can't seem to find a good solution. I did find why it is running slow. If ask the full ...
0
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1answer
55 views

SQL query for all combinations without repetition

I need a function for calculating combinations without repetition from a list. Example: I have a list of names e.g. Tom Bob Paul Tina Now I need a list of 3 names out of the 4 without having a ...
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0answers
33 views

Low performance oci_execute

I work with a PHP application that connects to an Oracle database. Sometimes, the PHP executes a large query from a large database the page loads for ages (more than 200s). But I've seen something ...
1
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2answers
48 views

Making a Database Online [closed]

I am so confused with this issue, I have vb.net application and it has a sql database . Now, I want this application to access the sql server from anywhere , because there are many clients sharing ...
1
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0answers
60 views

Database Mail not sending

I'm trying to send email using the DatabaseMail on SQL Server 2008, I can see my emails sitting in the msdb.dbo.sysmail_unsentitems But they just sit there, I get no error messages. I've checked ...
1
vote
1answer
36 views

Turning of Autogrowth for particular file

We have a primary file group with several files each on different disks. One of the disks is nearing capacity and as such we have had to switch off the auto growth for that file. Is there anything I ...
1
vote
1answer
32 views

What is the generally accepted method and tools for profiling MySQL queries?

Profiling database queries is difficult, and dependent on database technology. In MySQL, what is the usual (or, in deference to that, a great) process for profiling a query? For example: Run the ...
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0answers
12 views

Creation of a table with foreign keys in postgres is taking longer time [duplicate]

I am wondering if someone can help me understand this. I tried to add an column to a table of 22000 rows which is referencing other tables(one of these tables have 0.5 million records). It didn't ...
1
vote
1answer
69 views

Way to run SQLCMD without storing password in text format

Is there a way to run sqlcmd from a batch file where I don't want to store the password in plain text format. I have done some research and found the system variables method(store password in system ...
0
votes
1answer
52 views

Select post and concatenating all categories it belongs to

I have 3 DB tables POSTS +----------+----------+----------+ | id | title | content | +----------+----------+----------+ CATEGORIES +----------+----------+ | id | title | ...
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1answer
28 views

selecting rows that have n foreign key conditions satisfied

I'm trying to filter a master table rows based on 2-more conditions from the relative foreign key relation, i came up with this which is working fine, but i just can't convince my self that it's that ...
1
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0answers
51 views

Stored procedure taking much longer than query [closed]

I have a simple code segment that runs in about 1 second when run alone, but more than 5 minutes when deployed as a stored procedure. I'm using sql server 2008. Unfortunately, I can't post the code ...
1
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2answers
50 views

How to get the first or last row in ordered result set, depending by column value?

I have the follwoing result set from the table PUNCHREPORT EMPLID Name PUNCHDATE PUNCHTIME DEVICETYPE .................................................................. 70 ...
1
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1answer
65 views

Running queries directly on DB2 databases

Just have a general query, if it is really fine or safe to run long select queries on RDBMS production Databases specifically DB2? If NO, what are the major risks and issues in executing select ...
3
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0answers
45 views

Using Import Wizard with Access - No null values

I am trying to import a table from Access to SSMS using the Import Wizard but when I do the resulting table has a lot of empty strings instead of the NULL values that I am expecting. How do I make ...
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0answers
12 views

Datastructure to save relations between more than two entities and lists

I am trying to building an Information Extraction system(IE). I wrote a program that will detect entities and extract relations between them. Now I am saving the relations in the following SQLITE ...
0
votes
1answer
33 views

two auto incrementing columns

OK I have hit an issue, now I was going to look at having two auto incrementing columns, but I cant using InnoDB. So I am after a Solution. I have a table called queue. Everything to do with my task ...
0
votes
1answer
35 views

Postgresql Function Trying to Insert into 1 row instead of 2

Postgresql 9.3, Mac OS X 10.6.7 I created this function and I would like to insert both results into the same row. Obviously the way I have it inserts into 2 rows. First, here is the Table T1: ...
4
votes
1answer
124 views

Optimizing concurrent updates in Postgres

I'm running concurrent Postgres queries like this: UPDATE foo SET bar = bar + 1 WHERE baz = 1234 Each query affects the fixed K number of rows, and I can't find a way to enforce the order in which ...
1
vote
2answers
49 views

Oracle patching

Hi everyone I'm a student and I need a help with Oracle patch's. My DB 10.2.0.5.0 I don't understand how to check which of CPU and PSU patch's were installed. When I try to use sql select * from ...
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0answers
86 views

How to deploy a build from Visual Studio online to local SQL Server?

We are developing our SQL Server 2008 R2 database via Visual Studio 2012 as a database project which uses Visual Studio Online as its source control system. We would like to pull the latest build via ...
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34 views

Error on job - need to troubleshoot

Need Suggestions: One of our Production Servers contains a job (Daily run) which gets the Data from another Server and dump into local DB. From last couple of days, it is failing with the reason ...
0
votes
1answer
61 views

Database design Problem for the web-app

Hello I am in a problem of designing a web-app database schema. Suppose I have 10 shops and every shop gives deals on every different day Sunday, Monday and so on and for limited time period like ...
2
votes
0answers
48 views

“Wide” vs “Long” Database Structure - Is there a logic when to use which? [duplicate]

I'm currently setting up a database to house records for an application I'm writing and am trying to come up with the most efficient DB structure to use... Of course I know that there are as many ...
0
votes
1answer
53 views

Create SP for inserting data from a table to a table

I have a table that has 1 record where one field may have 2 values separated by commas (in that cases I have to create 2 records with those values separated in 2 row and the other field values are the ...
1
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0answers
50 views

Join and aggregate result and insert blanks for missing appendants

Consider these two simplified tables: CREATE TABLE "sources" ( "id" serial NOT NULL, "name" text NOT NULL, CONSTRAINT "sources_pkey" PRIMARY KEY ("id") ); CREATE TABLE "values" ( ...
0
votes
1answer
25 views

SQL - referential integrity - Foreign key and Check constraint

Please let me know if below two declarations are same. create table R1 ( a INT PRIMARY KEY, b INT references K(w)); Note: K is a table with single attribute w as primary key create table R1 ( a ...
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0answers
31 views

Cohort analisis for gamers activity

I want to do some cohort analysis of gamer activity in my games. By cohort I mean some set of users who registered (or had first activity) on some particular date. For example: users registered on 16 ...
0
votes
1answer
32 views

SQL - Query on table creation, referential integrity

Please let us know what does the below definition means on table creation. CREATE TABLE A(w INT PRIMARY KEY); CREATE TABLE B(x INT PRIMARY KEY REFERENCES A(w) ON SET NULL) As per my understanding, ...
2
votes
1answer
71 views

How do I write a mysql query to combine data from related tables into a single summary?

I'm having trouble defining the data in a query for a chart. I want to summarize data from the first table and combine it with a data summary from the second table. Products - (serial_number, date) ...
0
votes
0answers
22 views

Reducing log files? [duplicate]

I have a database that has a log file of nearly 80 GB. Database size 180 GB. The recovery is set to Full. What is the correct way to shrink the log file without using the shrink option in SSMS as ...
0
votes
0answers
25 views

how to clean huge Dbwarden QueryHistory table

dbwarden is Comprehensive database monitoring solution for SQL Server 2005+ which i am using. i found that dba_LongRunningQueries – Runs every 5 minutes. This will run usp_LongRunningQueries to ...
10
votes
1answer
187 views

Rejoining range seek on nullable composite index?

For the following schema and example data CREATE TABLE T ( A INT NULL, B INT NOT NULL IDENTITY, C CHAR(8000) NULL, UNIQUE CLUSTERED (A, B) ) INSERT INTO T (A) ...
4
votes
2answers
60 views

List minutes instead of grouping by them

Looking how to list minutes 1 to 120 from a 2 hour interval timestamp field instead of getting each minute from both hours together. What I want is something like this: min COUNT(*) 1 ...
0
votes
3answers
65 views

How to return last used record?

I have simple table called ips with 2 field ip and address, which schema is following CREATE TABLE IF NOT EXISTS `ips` ( `id` int(10) unsigned NOT NULL AUTO_INCREMENT, `address` varchar(255) ...
1
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0answers
40 views

Testing equivalence in strings with different character sets

I have to synchronize a number of tables with string columns between two databases: the source Oracle 10.2.0.3 NLS_CHARACTERSET WE8MSWIN1252, NLS_LENGTH_SEMANTICS BYTE the destination Oracle ...
0
votes
2answers
58 views

Check and Retrieve those results where a cell(row) contains atleast one value from many values in a column [duplicate]

Let me give you an example : I have a table (name = posts) which contains following rows: id | title | .... | names 1 | . | . | . | . | . | 4 ...