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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SQL Server very slow response

Sql server 2012 is very slow in response to any query from the application. Even using SSMS to try connect often results in time-outs. The log files were recently moved to their own drive as they were ...
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1answer
324 views

Query to find optimal filegroups for objects

I have been assigned a task to create four file groups (one per volume) locate tables so that they are located in a manner that during an ETL process no filegroup is being read and written to at the ...
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I need help optimizing a not that complicated query that returns unexpedcted performance problems

I have a table that stores details about incoming and outgoing phone calls such as when a call was made, or when a call was received, the phone number of the caller, and the phone number of the ...
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Database search with multi joins

I have a MySQL database and I want to perform a little bigger search. I have about 10k records in one of the tables and It's expected to grow, but slowly. The biggest problem is that to perform the ...
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1answer
30 views

Limit balancing results by a column

I have a web crawler that have a table with tokens to crawl and each token have a fk_location column that is the website where that token must be processed. I also have a function that returns me the ...
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1answer
69 views

Very slow update with subquery (different tables)

I run this query to update "domains" table based on "log" table: UPDATE domains SET domains.mx_collected = 0 WHERE domains.domain IN (SELECT log.mail as domain_name FROM log WHERE `time` >= ...
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Update Only Rows With Shared/Similar Value [migrated]

OK - I have a simple table - below - what I am trying to do is to identify only those rows that have a shared value - so anything that has a shared "apc" value - DO x else Do Y CREATE TABLE #test ...
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1answer
48 views

How can I control the order of a query regarding to inner join

I have 3 tables. They have table_a 5m records table_b 20m records table_c 20m records I'm performing the query below. SELECT * FROM table_a a INNER JOIN table_b b ON a.a_id = b.a_id AND ...
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2answers
81 views

SQL query for next occurrence of specific date

I am working on a function for our database that contains contract data. Each contract expires on a certain date, and then each contract has an expiration type that determines what happens after that ...
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2k views

exporting oracle tables on command line as sql files

I use exp and expdp to export database tables on command line but it generates binary .dmp files. I want to export/import tables as .sql* files on command line like pl/sql developer app can do. Is ...
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2answers
2k views

Oracle 11g: “With Clause” very slow

I have written a query utilizing Oracle's with clause. I have identified one particular with clause in a larger query to be really, really slow. Here are three versions of the same query, they all ...
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how to check the condition before running the sequence container in ssis2005

I need to split the DB into Current(2012,2013,2014) and History(previous to 2012). Every year I need the oldest year should move to history DB i.e if 2015 enters then 2012 should move to history. ...
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264 views

Designing Simple Schema for Disaggregation of Demand Forecast

I am doing a simple database design task as a training exercise where I have to come up with a basic schema design for the following case: I have a parent-child hierarchy of products (example, Raw ...
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1answer
36 views

Sql Server sys.Traces log

Working with traces on production server I found some mysterious entries to me in sys.Traces, When I run below query it shows me status of all traces as ‘Paused’ along with entries in ...
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3answers
647 views

Select query to retrieve values even if are null

I need some help in a query. Need to retrieve data from 1 table, even if one of the field has null value. Here's an example: Select name, SUM(credit) as credit From expenses Where name like ...
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2answers
19 views

getting one day timestamp in mysql

Please consider the following stored procedure I have: ORIGINAL Stored Procedure: -- -------------------------------------------------------------------------------- -- Routine DDL -- Note: comments ...
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62 views

Are these linked server queries susceptible to SQL injection?

I'm using a stored procedure to generate a create table script on the fly based on parameters passed into it. I am validating that the server exists, and then validating if the table exists in the ...
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1answer
36 views

Problem with foreign keys

I do ALTER TABLE bdt.auth ADD CONSTRAINT `depositor no.` FOREIGN KEY ( `depositor no.` ) REFERENCES bdt.depositors( `depositor no.` ) ON DELETE CASCADE ...
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1answer
49 views

How to make the SQL query more efficient?

I use mysql under Linux. My table is about 8000000 rows. The table has index(advertiser_id,activity_date),(activity_date,advertiser_id,activity_type). The table is looks as following: activity_date ...
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1answer
192 views

How to pass a parameter into a function

At the moment I have a view created, see it here in the answer. How can I create a function on that cross tab, so I can pass a date, and get data for the specific date? Also is it a good practice to ...
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1answer
1k views

How To Execute an Integration Services (SSIS) Package from a SQL Server Stored Procedure

i am executing query like this on sql server 2008 R2 DECLARE @returncode int EXEC @returncode = xp_cmdshell 'dtexec /f "C:\certs\SSIS Disposition\SSIS Disposition\SSIS Disposition\Package1.dtsx"' ...
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1answer
67 views

Optimizing large MySQL SELECT WHERE IN clauses

How can the following SELECT WHERE IN case be optimized? I have a table with over 100 million rows with only 3 columns. The primary key (col1) is a 127 varchar. I am performing a SELECT col1 WHERE ...
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2answers
83 views

How to make a table name an attribute in PostgreSQL?

I have received hundreds of tables in PostgreSQL with identical structure and each containing similar data of a different day, so that the table name is the date of the data. I would like to Union ...
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1answer
17 views

Creation of a simple field failed in MySql [duplicate]

CREATE TABLE bdt.transactions ( `transaction no` int UNSIGNED NOT NULL AUTO_INCREMENT, data date , by int NOT NULL , hours int NOT NULL , ...
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2answers
47 views

SQL Server Baseline and Performance Optimization

I've been struggling a little bit around Performance Troubleshooting including baseline and troubleshooting of SQL Performance. Could anyone help with this or point me to where I can possibly get a ...
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0answers
54 views

Database backup taking longer than usual to a networkshare

The SQL server does backups with this command to a network share \BackupServer\weekeklybackups" BACKUP DATABASE DBNAME TO DISK = '\\BackupServer\weekeklybackups\DBNAME.BAK' There is a 1 gig network ...
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counting values of unread values using mysql and php

I am building a messaging system using mysql and php. I have gotten to a point where I want to select messages received by a user and also count the unread messages received from different users to ...
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1answer
30 views

Output another word instead of the word in the table in a query

Suppose I have a table where I have a field which can have to values: "enabled" and "disabled". Suppose want my query to output "unblocked" instead of "enabled" and "blocked" instead of "disabled". ...
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1answer
80 views

Find the user with closest taste of mine

I trying to write in SQL the following requirement: Each user can rate as much films as they like. (1= I don't like, 5=I love it) And the system should provide to the current user a list of films ...
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33 views

How to join 3 tables together given 2 many-to-many relationships tables in between?

I have 3 main tables: Person, Publication and Conference and 2 many-to-many link tables in between: person_publication and person_conference I want to join all 3 main tables together (showing me all ...
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1answer
38 views

SQL Server Cross Domain Transcational Replication

Has anyone got any documentation for doing/implementing Cross Domain SQL Server 2012/2008R2/2008 transactional replication document or steps (with screenshot or without screenshot) Thanks for your ...
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1answer
99 views

Why is this second query more expensive than the first?

While reading Graph Databases book, I came across this excerpt: I can't figure out why the second query is more expensive than the first. Indeed, both filter on the Bob person. May anyone ...
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2answers
100 views

Are ORDER BY clause & ROW_NUMBER duplicating functionality when I need top n queries

I have a table that tracks violations for a student. I want to count the number of violations and select top 2 violators from each class. The query would look like this SELECT * FROM ( SELECT ...
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1answer
42 views

database normalization to 3NF [closed]

I am just at a complete lost. I need help with this. There should be 12 tables (or perhaps 11 since one table has just a single attribute) when you are finished with the normalization and merging of ...
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2answers
54 views

Limiting read access in postgres to few rows

We have a requirement where we want to limit the maximum no. of rows that a select query can return when its done using a particular login. So basically we would like to append a limit clause to any ...
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1answer
49 views

How to perform same DML statements on two different servers (Oracle and SQL-Server) simultaneously

I have two servers, Oracle and SQL-Server. I have same database on both the servers. I want to perform DML (insert,update,delete). How can I perform same DML statements on both the servers ...
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70 views

SQL Server Perfmon % Processor Time unbalanced [closed]

I am somewhat of an accidental DBA, and I'm troubleshooting a SQL Server box where performance has been notoriously poor (as reported by the customer). I was not involved in the initial planning of ...
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2answers
26 views

Design for table with multiple links to other table

I am designing a database to keep track of our network equipment. My db has 2 tables: sites & circuits (circuit = cable) & (site = property location) Each circuit runs between two sites, so ...
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1answer
43 views

Simple query not returning blank records

Very simple example here to a very frustrating treasure hunt for the mystery character. I have a table with a varchar(1) NOT NULL column - everything default - ANSI_PADDING & NULLS are ON for the ...
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0answers
14 views

set error message on out variable in mysql stored procedure

I have a stored procedure: fill_DATA (serial varchar(20), OUT oError) I am doing an Insert operation here. so what I want is to SET value of oError for any error message in case the query fails to ...
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1answer
32 views

Calculate value differences of rows before and after bounded by multiple referenced rows

Supposed I have a user travelling table like this: id | start_time | end_time | location | ----+--------------+------------+------------+ 1 | 1 | 2 | Loc_A | 1 | ...
4
votes
1answer
111 views

Pull data from multiple tables in a view or function

There are 3 tables from which I need to pull data, and print it in a specific way. http://sqlfiddle.com/#!15/59481/8 You can refer to this question to see how the query was produced. In the fiddle ...
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2answers
551 views

SQL Server 2012 copy database failed

I want to make a copy of database in the same SqlServer . so, When i using the Copy Database Wizard, it throw error: ( I did this steps with a test DB and it works fine !!!!) config: sa user ...
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1answer
20 views

Return Parents With Only One Child

In a Parent and Child relationship, I'm trying to return Parents that only have one Child and a where clause applied to the only child firstname like 'tom' t-sql pseudo: parents with only one child ...
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1answer
44 views

Restore InnoDB from .frm files

My database crashed and my PC and I now only have the .frm and .ibd files left. Is there any way to restore my database?
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32 views

Retrieve SPID For SSRS Request

Is it possible to determine what SPID was created to execute a SSRS report? I am trying to prevent users from running the same report multiple times. So what I was thinking of doing was retrieve the ...
0
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2answers
2k views

How to select only first column dynamically on mysql

I have to select only first column. Because of i dont want to select all columns like SELECT * FROM table. But my first columns may vary like following: id article_id user_id product_id page_id etc.. ...
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1answer
305 views

Tree structure hierarchical query sorting

I have the following structure of table. CREATE TABLE table1 ( serial_num integer NOT NULL, parent_num integer, parent_key text, key_ary_num integer[], level integer, rank integer, ...
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2answers
52 views

Create a result for a line chart with dates

I have this table in SQLite which I use to record the risk level identified in vulnerability assesments according to the day the scan was performed. This table looks like this: Scan Date | Risk ...
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1answer
35 views

How to do the complex nested select SQL?

I have two tables, table1 is as following, id is primary key, table2_id is foreign key id date aid table2_id message 1 2014-03-19 16:21:02 121 1 login from xxxx 2 ...