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

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3
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3answers
658 views

How to achieve many to many relationship in this database design?

I am currently working on small travel application in which users can add other users' trips in their wishlist. I am facing difficulty in designing database for wishlist. What I have tried so far is: ...
0
votes
2answers
325 views

Is it possible to speed up this PARTITION BY query?

I've got a timeserie table. Each datapoint has also a statut field which indicates its providing source. I'd like to request last available datapoint as of date T but there could be several results, ...
1
vote
1answer
62 views

SQL Pivot column

I'm trying to figure out how to create a From and To column based on ID.LocationID Column. I'm hoping with a suggestion this can be done (i can figure it out) without having to create sample tables ...
2
votes
1answer
112 views

Why am I getting cardinality issues when querying a single table

I have the following query: SELECT [iri].[RateItemKey], [iri].[RateItemType] FROM [prism72].[dbo].[ispRateItem] AS [iri] WHERE [iri].[Status] = 1 AND ( ...
0
votes
2answers
1k 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 ...
-1
votes
1answer
67 views

Calculate number of items with distinction using SQL [closed]

I have a product Table like this; Product | Operation | Component A | 10 | C1 A | 10 | C2 A | 11 | C3 B | 12 | C3 B | 11 | C1 B ...
0
votes
1answer
52 views

Work with table named Group [closed]

I have a table named Group in my database , when I try to work on it it gave error : SELECT GroupID,GroupName FROM Group it said : Msg 102, Level 15, State 1, Line 1 Incorrect syntax ...
2
votes
2answers
4k views

Postgresql and UTF8 to Latin1 conversion?

We have a Postgresql database where the data is in Latin1. Apparently someone loaded some UTF8 encoded data into it since when I select data from some of the columns, I get stuff like: SELECT ...
1
vote
1answer
25 views

Correlated query Issue [closed]

In the below query i have 2 tables product and productstatus. In product table I have productId and productName and in productstatus table there are locationid,productid,currentstock and ...
5
votes
2answers
1k views

Is a Postgres long-running query aborted if the connection is lost/broken?

If I open a connection to Postgres and issue a long-running query, and then break the connection (e.g., kill the client process that opened the connection), will the long-running query continue to ...
0
votes
1answer
76 views

SQL Query - How do I Select Into new columns

I'm trying to write a query that will put values in three different columns. I have the query pulling the information I need, I just don't know how to split the values out into different columns. ...
1
vote
2answers
114 views

Insert New Foreign Key Row for new Strings

Lets say I have a table new_data like this: ndx | someval | somemachine serial | integer | integer ---------------------------- And let's say I have a reference table new_data_someval_ref: ...
2
votes
2answers
8k views

Currently all connections getting “Timeout expired”

I have an application which connects to SQL Server. Currently I am getting, Timeout expired. The timeout period elapsed prior to obtaining a connection from the pool. This may have occurred because ...
3
votes
3answers
570 views

SELECT all substrings (n-grams) of length n?

How could I select all n-grams, ie. substrings of length n from a string using SQL? For example, the 3-grams of string example are exa, xam, amp, mpl, ple. I'm using PostgreSQL to be more precise.
0
votes
1answer
229 views

SQL Server stored procedure that would enforce atomicity?

Let's say I have following insert statements INSERT INTO tEmpl (lastName) VALUES('Smith') INSERT INTO tEmpl (lastName) VALUES('Jones') INSERT INTO tEmpl (lastName) VALUES('Smitty') INSERT INTO ...
4
votes
0answers
152 views

SSRS URL Changes while navigating

I am trying to track down the root cause of this issue I keep seeing. We have SSRS running with a custom URL like https://reporting.companyname.com/reports. When I connect to that address I can ...
0
votes
1answer
208 views

Select Statement to generate result, for Group by per second and link with Table

i tried to search in existing queries but didnt find any related thread. i would like to run a query in user table (for example), and like to get output result on per second bases. and give me zero ...
1
vote
1answer
901 views

SSRS pivot dynamic columns

I've tried to port this from a similar post, SQL query to return a column per date in date range? however I haven't been able to quite get it to do what I need... Please find some example code below : ...
1
vote
2answers
458 views

Error While restoring DB2 db from AIX to AIX server?

I am required to migrate 1 database One AIX server to another AIX server. To achieve, I took backup from 1 machine and followed below steps 1st Command I tried is as following. db2 restore db ...
0
votes
1answer
72 views

Query output conditional upon values in dataset

If the number column contains values 5 AND 6, AND the value X exists in the chr column, I would like to exclude rows with 10 in the test column. But, if the number column contains values 4 AND 5, AND ...
-2
votes
1answer
87 views

Why is this SQL query illegal? [closed]

Students is a table with two fields name and grade for a number of students. I wonder why the following query in SQL is said to be illegal: SELECT Students.name, MAX(Students.grade) FROM Students; ...
1
vote
0answers
291 views

SQL: Dynamic Pivot Column, In the column's row value How to get Top 1 value

In my following query I need to get the top 1st record's value in pivot row value. So basically I get all parts and if there is a service entry with that part and a revision number I used that ...
0
votes
1answer
19 views

Postgres Grouping of Like Results

Our database is running on Postgres 9.3. We have a table called notifications. Notifications contains id, type, triggering id, source id, and some other information. What I am trying to do is select ...
2
votes
4answers
521 views

Re-writing a sub-select as a condition on a column generated with 'over (partition by …)'

I am wondering if it would be possible to use over (partition by...) clause in order to avoid using a sub-select in the example below: declare @t table ( id int ,code char(2) ...
1
vote
1answer
83 views

Slow Query with LIMIT

We have this query: SELECT "messages".* FROM "messages" WHERE "messages"."account_id" = 1 AND "messages"."status" = 'unread' AND (created_at >= '2014-04-24 01:00:00.000000') ORDER BY id DESC It ...
1
vote
1answer
121 views

Delete from table where two of the three keys in another select

I have tableA which has 4 columns: IDA (bigint), IDB (int), IDC (varchar(255)) and comment (varchar(255)). The primary key is (IDA, IDB, IDC). I'm required to delete the records where the count of ...
7
votes
3answers
2k views

Should order of column in where clause be same as the index order?

I was reading this use-the-index-luke.com which explains in detail how indexes work. One of the things this person has re-iterated that the order of indexes matter a lot and to make the query fast the ...
1
vote
1answer
87 views

Query performance issues

I need help in improving the performance of the following query. It has the purpose to select one record out of a group of records with an identical ID (doublettes). Rules are that Date2 must be the ...
0
votes
1answer
58 views

Transform it into 3NF [closed]

Consider the relation LEASE, where a person can live in only one building, and a building can charge only one rental rate: RELATION = LEASE (PersonID, BuildingID, Rent), Primary Key = {PersonID} I ...
2
votes
2answers
191 views

Get seconds of day in Postgres

In Java we use Joda-Time to get the seconds of a day as an int value (despite the date): date: 10-10-2014 00:00:30 -> second 30 of day date: 11-10-2014 00:01:30 -> second 90 of day date: ...
0
votes
3answers
375 views

Case when not return more than one value

I try this, but the SwitchCase can not return more than one value. WHERE CP.NumIntAut IN ( CASE WHEN @NumIntAut IS NOT NULL THEN (@NumIntAut) ELSE (SELECT NumIntAut FROM ...
1
vote
1answer
80 views

Set bit in Table A if values are present in Table B

I have two tables, Containing up to ~10 million entries. TableA which has 3 columns: IDA (bigint), IDB (int) and CHK (bit). (IDA, IDB) is the primary key. TableB which has 2 columns: IDA (bigint), ...
5
votes
1answer
419 views

SQL Server stuck in single_user with auto_update_statistics_async on [closed]

Books online states Before you set the database to SINGLE_USER, verify the AUTO_UPDATE_STATISTICS_ASYNC option is set to OFF. When set to ON, the background thread used to update statistics ...
0
votes
1answer
577 views

How do I count the number of different child id's belonging to a parent record?

For instance I have two tables in a music database. Table album and table track. Each track record has (amongst other things), an album_id and an artist_id Each album record has a unique album_id ...
1
vote
1answer
33 views

How to group by on two fields and count

CREATE TABLE IF NOT EXISTS `usuarios` ( `id` int(11) NOT NULL AUTO_INCREMENT, `user1` varchar(255) DEFAULT NULL, `user2` varchar(255) DEFAULT NULL, PRIMARY KEY (`id`) ) ENGINE=InnoDB DEFAULT ...
0
votes
1answer
58 views

update column without auto timestamp update

Hello everyone I have got a product stock table with a time-stamp column so the so any updated to that row will update the time stamp ,I'm happy with this setting but sometimes I want to update the ...
0
votes
2answers
80 views

SQL Server database performance is very poor after a month of use [closed]

I am quite new to SQL server and have a question regarding database speed. The database (about 50 MB big) was very fast in the beginning. Now, a month later, the speed is a lot worse. I run a script ...
2
votes
2answers
8k views

Possibly tempdb out of space or a system table is inconsistent

While running DBCC CHECKDB I got this error Msg 8921, Level 16, State 1, Line 1 Check terminated. A failure was detected while collecting facts. Possibly tempdb out of space or a system ...
3
votes
1answer
378 views

Need help with a Running Total Issue

Using SQL-Server 2008 R2 and Report Builder 3.0 Here is my query without the running total column: SELECT CostManagement_CommitmentDetails.Id ,CostManagement_CommitmentDetails.LineNumber AS ...
2
votes
3answers
17k views

What is the difference between logical schema and physical schema?

While going through Database architecture I came across Schema's . I am very much confused with: Logical schema Physical schema How these two schema exist in the Database? How can these be ...
0
votes
1answer
57 views

Index file - size changed

I realised today that my index file(which is about 250GB) is smaller than yesterday for about 7GB. Everything, I done in the meantime, was index rebuild. Is it possible that index rebuild is the ...
0
votes
1answer
29 views

numbering distinct column values in an ordering but not just displaying the total

I have a column with non-unique entries, we'll call this column "State" (representing the state where an order was shipped to) and a second column called "Times" (representing the times that an order ...
5
votes
1answer
122 views

Unknown _TransactionIndex table in Azure SQL Database

Just noticed today that there is a random table in my Azure SQL Database that is named "_TransactionIndex_{guid}" It has 1 column, Id, that contains 8 GUIDs. Couldn't find any information about this ...
0
votes
1answer
79 views

Query to select distinct name based on several factors

I have a table with the following data (simplified here): ID | PolicyName | Setting | State | Value 1 Default DiskUsage Enabled 1 2 Default Memory Enabled 1 3 Default CPU Enabled 0 4 Personal ...
0
votes
2answers
315 views

Is there anyway to search PL/SQL reserved words with contains function?

Is there anyway to search PL/SQL reserved words with the contains function in the Oracle? We would like to search keywords such as "test for" or "test do" with the contains or catsearch functions ...
1
vote
1answer
129 views

How to Choose an SQL Database for Simple Data Preparation & Analytics

In the interests of not making this a shopping list: please advise on "how" to choose a the right tool, as opposed to which is the best. E.g: Which questions should I be asking myself / client? What ...
2
votes
2answers
99 views

SQL Insert Statement Persists Two Records When I Need Just One

I have altered it to include hardcoded variables when I pulled this chunk of code from the stored procedure. I ran it independent of the application with the same result. I need one insert statement ...
0
votes
1answer
52 views

SQL Insert Statement Persists Two Records When I Need Just One [duplicate]

I have altered it to include hardcoded variables when I pulled this chunk of code from the stored procedure. I ran it independent of the application with the same result. I need one insert statement ...
0
votes
3answers
633 views

Converting huge ASCII file to flat and convert

I am not a db administrator but I thought to ask this question here. I have several very large ASCII files (3-5GB each) that I need to extract the data and then sort it. The instructions say to ...
1
vote
0answers
18 views

Is there a faster way to get UNION ALL behavior in Postgres? [duplicate]

I have a table (t0), in my Postgres DB, with data that looks something like this: t1_id t2_id 1 1 2 1 2 1 4 null 4 null 5 null And I have a query to return my ...