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. ...

learn more… | top users | synonyms (1)

2
votes
1answer
590 views

Replacing a PHP loop with a MySQL Query

I have a MySQL database table where I store a user_id and a hash each time someone logs in. The hash is stored in a persistant cookie so it doesn't change as users log in and out of the site. The ...
2
votes
2answers
2k views

Get all partition names for a table

I want to list all the partitions created by dynamic triggers in PostgreSQL 9.1. I was able to generate a count of partitions using this related answer by Frank Heikens. I have a table foo with an ...
3
votes
1answer
1k views

Update “NULL” string to Actual NULL value

I have a table that contains NULL values but the problem is that some of the values are actually string "NULL" and not actual NULLS so when you trying something like where date is null it will not ...
0
votes
2answers
105 views

How to write a script to push the server time to out?

Background: I am programming a database in Ms-Access and using SQL-server as the Back-end. But since my database will be a multi-user platform I need to make sure that whenever a user is posting data ...
0
votes
2answers
1k views

Only allow one checked row in a Column in SQL Server [duplicate]

Background: I've only just begun programming in SQL... barely begun even. But I have been thrown into the deep-end left to find a way and learn to program SQL. Question: Is is possible to have a ...
1
vote
4answers
923 views

Unsure how to implement certain constraints and relations in this relational database schema

I am in the middle of designing the dB for school project- airline ticketing database.(Using MySQL workbench) So far, I came up with the following design: Here are couple things I can't figure out: ...
1
vote
2answers
4k views

Oracle SQL, how to filter on a set by a rank?

I am struggling with the following SQL query right now: http://sqlfiddle.com/#!4/736a7/12 select uc.* from usercredential uc inner join users u on u.userid = uc.userid inner join credential c on ...
0
votes
1answer
56 views

How should I set up these tables in my relational database?

I'm working on a project where a person can create a survey with custom questions and display the questions in whatever order they choose. They can break the questions into sections. The problem I'm ...
0
votes
1answer
349 views

exec xp_cmdshell 'sc \\<servername/serverip> start <service_name>'

When I execute this on sql server on another machine (in same sub net) I am getting "Access is denied". But when I did it from command prompt (sc \ start ) it is working. Please advice why I am ...
16
votes
2answers
23k views

How to optimize a query that's running slow on Nested Loops (Inner Join)

TL;DR Since this question keeps getting views, I'll summarize it here so newcomers don't have to suffer the history: JOIN table t ON t.member = @value1 OR t.member = @value2 -- this is slow as hell ...
2
votes
4answers
1k views

search for something in the first 1000 records in the table

If I do the following MySQL query select * from table where name Like '%john%' limit 5; that mean the query will search all the mysql database table and return only the top 5 results that match the ...
2
votes
3answers
83 views

How to take SQL Server database under this scenario?

I have a database of size 290 GB running on SQL Server 2005 (compression is not available) and disk space is z: drive 250 GB and Y: drive is 80 GB. How can I take a full backup in this scenario? How ...
0
votes
2answers
8k views

MySQL: Join one Row in a table with two Rows in other table

In my MYSQL Database COMPANY. I have two tables, like below in my diagram (arrow shows relations): `users` `user_login` +--------------+ ...
2
votes
1answer
105 views

Find application password expiration date

I changed password of my application on one sql server? when I am using Login property command I am getting last login date. I want to know when my application password is going to expired in SQL ...
13
votes
2answers
10k views

MySQL and window functions

It seems that MySQL does not support window functions. E.g. the simple: COUNT(*) OVER() AS cnt does not work. What I am not sure is if this applies to commercial version as well (I assume the ...
3
votes
2answers
2k views

Reducing high VLF count

I have been using Brent Ozar's sp_blitz script to review our database setup and have found that the VLF count is high (13562!) on the primary DB since changing to Full recovery model. I ran a full ...
1
vote
2answers
910 views

MySQL: CAST + SUBSTR vs. FLOOR + MOD

I have a field in a mysql database where dates are stored as BIGINT like YYYYMMDDHHMMSS (PHP: date('YmdHis')). I'm building a query, where I check the amount of rows per hour and have tried two ...
5
votes
1answer
677 views

How does order of index affect performance in SQL Server?

I am wondering how does order of index affect performance (ASC, DESC) ? If it affects, why ? And which order should I choose ?
1
vote
1answer
586 views

import csv data stored in a blob column

Here's what i need to do: Users will upload CSV files into SQL Server 2012 blob column Each night, i would like to take each file and import the data into table I will have 2 web sites using the ...
1
vote
2answers
42 views

Order by on an alphanumerical column

I have a column that has strings of the following type: Miller 10 Allen 20 King 10 .... Jones 100 I try to sort the column based on the numerical part of the data. I tried the following: SELECT ...
1
vote
1answer
2k views

Is there a way to truncate table that has foreign a key?

Is there a way to truncate table that has foreign keys ? Delete and reseed can take too long. Is deleting and recreating keys only way ? If so is there a tool that does this ?
1
vote
2answers
17k views

How to check if Oracle DB process is running in Unix and where Oracle DB is installed

I am new to Unix and trying to find out a command that checks if Oracle DB is installed in my Unix box. I came across commands ps -ef|grep smon and ps -ef|grep pmon in net. But which is the correct ...
1
vote
1answer
584 views

Multiple like conditions for same column?

How do I write a query for a Oracle database when I have several "like" values for the same column (in my example data "name")? My example data for table "address": name like "John" name like ...
2
votes
2answers
1k views

SQL Server stored procedure working when run manually, not running from SQL Server Agent

I have a procedure that runs fine using the execute command in SSMS, however putting the same command in a job gives the following error. line 9, character 9, unexpected end of input The code ...
2
votes
1answer
37 views

Which MySQL directories to back up using FTP

My server has been hacked and I only have FTP access to recover my data before reinstalling the OS. Which/where are the directories that needs to be backed up? Will MySQL be recovered back to its ...
7
votes
5answers
1k views

Database design: Dividing multiple identical tables, good or bad?

I am very new at SQL and databases in general. I only use them for the occasional homework so I haven't even tried to master them. I have seats at a theater, the seats are divided into 4 main areas ...
0
votes
4answers
2k views

Space at the end of string

I have a SQL code like shown below: declare @str nvarchar(max),@i int set @i=0 set @str='abc ' declare @tbl Table(a nvarchar(max)) insert @tbl select @str while (select a from @tbl)<>'' begin ...
2
votes
3answers
2k views

Can I make sure two columns dont have the same value

If I have a table that looks like this CREATE TABLE foo ( id INT NOT NULL AUTO_INCREMENT, aa INT NOT NULL, bb INT NOT NULL, PRIMARY KEY (id), UNIQUE KEY (aa, bb), CONSTRAINT aa_ref ...
3
votes
2answers
2k views

How can I improve this nested MySQL query to avoid redundant WHERE statement?

I am trying to improve on a nested MySQL query, using the following table structure (omitting a few dozen not relevant to my question): tbl_users: ID | email (all subscribers to our email list) ...
6
votes
1answer
1k views

How do I optimize large table so queries that target only recent data perform optimaly?

So I have this table that is ever growing. Most queries are targeting just recent data, say one month old. I suppose this is common problem but I have no idea how it can be solved. I am open to ...
3
votes
4answers
1k views

What is the best permissions to set for only creating and managing own databases?

I want to create a login for a new user who could only create and manage their own databases. Other databases on the server should be read-only to that user. What would be a good set of ...
2
votes
2answers
17k views

Use CASE to select columns in UPDATE query?

I can use CASE to choose which columns to display in a SELECT query (Postgres), like so: SELECT CASE WHEN val = 0 THEN column_x WHEN val = 1 THEN column_y ELSE 0 END AS ...
2
votes
1answer
60 views

Show all results for past N “insert batches”

Every once in a while I have several users check in with some value: +-------+-------------+------+---------------------+ | id | user | RT | time | ...
1
vote
1answer
313 views

One call to `decryptbypassphrase` for decrypting all columns

If I use ENCRYPTBYPASSPHRASE to encrypt the full table then how can I decrypt full table easily by using DECRYPTBYPASSPHRASE? Actually I have to use DECRYPTBYPASSPHRASE ('passphrase', column_name) ...
0
votes
0answers
100 views

Insert performance deterioration over network [closed]

i have a strange issue with a windows application (in delphi) running on a win7 client. The application has a loops and inserts rows on a SQL Server table. It's simply an insert statement, repeated on ...
7
votes
2answers
2k views

Individual queries run on 10ms, with UNION ALL they are taking 290ms+ (7.7M records MySQL DB). How to optimise?

I have a table that stores available appointments for teachers, allowing two kinds of insertions: Hourly based: with total freedom to add unlimited slots per day per teacher (as long as slots don't ...
-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
vote
1answer
311 views

SQL Index order and performance based on cardinality and data

I've been working quite a bit on a query that's not operating very efficiently on a DB2 database. The thing will return up to 30k rows or so and take up to 10 seconds. I've been working on getting ...
2
votes
1answer
141 views

how to show only changed rows

if want querying the following table : EventDateTime (DateTime), Host (guid), Flag ( bit) 2013-04-01 05:00, {id-x}, 0 2013-04-01 05:01, {id-x}, 0 2013-04-01 05:02, {id-x}, 0 2013-04-01 05:03, {id-x}, ...
1
vote
0answers
302 views

Database Timeout Error from VB Application

Recently we are receiving so many database timeout error from different servers we are using vb application -- which will use ODBC connection to connect database - here no problem when we run the ...
0
votes
2answers
2k views

How do I open local files using heidiSQL?

I'm using HeidiSQL to access my remote MySQL db. Recently I was sent an .sql file. Is there a way to open this file using HeidiSQL? Does anyone know of a better way to graphically view and ...
0
votes
2answers
6k views

How to Drop Tables using a variable in SQL Server?

DETAILS: I am trying to create a stored procedure where I can pass a variable table name through from MS-Access to tell SQL Server to Drop a table. WHY?: In my Access Database I am running a ...
1
vote
0answers
122 views

Why is this query creating 300+ temporary tables in Mysql?

SHOW global STATUS LIKE '%tmp%'; set @UID = 132; set @param2 = 'cde'; set @param3 = 20130331; set @param4 = 'C'; select p.id, p.column44, p.column42, ue.column35, u.id, p.column43, p.column45, ...
0
votes
1answer
94 views

Hash in SQL query

I saw few sql queries with ### appended before and after column name in where clause like `select a from emp where a.###id### = 1` What is significance of these hashes?
2
votes
1answer
430 views

SQL Application Role access-control

I have been researching the use of Application Roles within Microsoft SQL Server and was wondering if there is a way to limit a user to only be able to set specific application roles. As I understand, ...
0
votes
0answers
87 views

Huge sizes Replication Tables in Sql Server db, how to deal with? [closed]

I've a sql server database that is configured to work with old software, i've no details about the software, but i know that DB uses replication. the DB size dramatically increases. When i ...
0
votes
1answer
397 views

Why is CDC capture failing due to a missing dbo principal

I am having a problem running the CDC change capture job against some of my test databases. The error message I'm getting is the following: Executed as user: NT AUTHORITY\NETWORK SERVICE. Cannot ...
1
vote
1answer
571 views

Moving model database

I have moved the model database by using following method For each file to be moved, run the following statement. ALTER DATABASE model MODIFY FILE ( NAME = modeldev , FILENAME = ...
0
votes
2answers
7k views

Oracle Undo tablespace users

Can anybody help me on "what all users are using the undo tablespace and how much" in oracle database 11g r2. any pointers would be much appreciated.
1
vote
2answers
2k views

Get most recent 100 records from the database

I am using SQL Server 2008, we have one database which contains 150 tables. We have introduced systimestamp DATETIME column in every tables. We do update this column with current timestamp whenever ...