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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Deleting duplicate rows with condition(Using SQL and LINQ)

I have a table with 5 columnsID,CPT4,CPT4Mod,ItemCharge,Eff_Date. Deletion Condition: When rows exists with duplicate CPT4and CPT4Mod field values but different ItemCharge and Eff_Date values, ...
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1answer
79 views

Handling empty fields

SELECT Name, SUM(Switch([Date] = DateAdd('d', - 7, DATE ()), NetAmount) )AS DAY1 FROM Customer GROUP BY Name My question is how to return the value 0 when the date is not present (an empty field). ...
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1answer
7 views

How can I aggregate multiple results from another table using something like BOOL_AND?

I'm using PostgreSQL as my database. CREATE TABLE users ( id SERIAL NOT NULL, name TEXT NOT NULL, PRIMARY KEY (id), UNIQUE (name) ); CREATE TABLE groups ( id ...
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2answers
20 views

insert inserted id to another table

Here's the scenario: create table a ( id serial primary key, val text ); create table b ( id serial primary key, a_id integer references a(id) ); create rule a_inserted as on insert to a do ...
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0answers
5 views

How to Select the First (or last) entry for a specific day

I have a table "AttendanceRecords" with entries like this EntryID UUID PRIMARY KEY, StafID UUID REFERENCES staffmembers(ID) NOT NULL, ArrivalTime TIMESTAMP NOT NULL, DepartureTime TIMESTAMP For one ...
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2answers
43 views

New Index on table cause table to be locked really often

Here are my tables : CREATE TABLE [dbo].[Trackers] ( [IdTracker] INT IDENTITY (1, 1) NOT NULL, [IMEI] NVARCHAR (16) NULL, [CreationDate] ...
6
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2answers
132 views

Why doesn't a delete increase unused space in a table?

If I populate the following table: IF OBJECT_ID ('dbo.CleanTableTest', 'U') IS NOT NULL DROP TABLE dbo.CleanTableTest; GO CREATE TABLE dbo.CleanTableTest (FileName nvarchar(4000), ...
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2answers
585 views

Outer Apply vs Left Join Performance

I am Using SQL SERVER 2008 R2 I just came across APPLY in SQL and loved how it solves query problems for so many cases, Many of the tables I was using 2 left join to get the result, I was able to ...
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1answer
5 views

SQL Query Help to get Quiz statistics

I'm coding a quiz web application and i need help. I've got three tables Nicknames : |USER_ID|NICKNAME| that stores USER_ID(autoincrement) and NICKNAME registered to my system. Questions : ...
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0answers
6 views

Sub queries in Apache Hive

I have a table with following structure col1 col2 col3 col4 category 300 200 100 20 1 200 100 30 300 2 400 100 100 70 1 100 30 200 100 ...
1
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1answer
26 views

Performance of single vs multiple column unique constraint

I'm using PostgreSQL 9.3. I want to understand if I have an option to make a constraint unique across the entire table vs. unique across a subset of the table (i.e. by using 2 columns in the unique ...
2
votes
1answer
201 views

How to allow connections to SQL Server with 2 differents ip

I have a small issue here: I have a SQL Server instance 2012 (let's call it INSTANCE) on a cluster. I also have 2 network interfaces for this instance: SQLINSTANCE.my.metwork ...
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1answer
25 views

Need help in incrementing the date in oracle

Error thrown as "Invalid number" while trying to increment the date. Given below is the query executed through sqlplus. Please help me on this. select ''''||to_date(:To_date, 'dd-mon-yyyy')+1||'''' ...
0
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1answer
71 views

how to select first 9 numbers from other table from database using sql query?

I want to fetch first 9 numbers from matching with other column please help me to find out thank you....? SELECT MAINFILE.facno,GLMAST.fglhead FROM MAINFILE INNER JOIN GLMAST ON ...
2
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3answers
445 views

SQL Profiler - Insert values?

I setup an SQL profiler to run, but I am not seeing any values for updates/inserts. Is there a way to see them? All I see is stuff like this: insert into some_tbl(id, col1, col2, col3) values ( @P0 ...
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1answer
35 views

Turning multiple fields in column to row

I have an issue that has really stumped me in SQL Server. I have recently had the need to insert a row in to a table, made up from a number of columns. I want to make the one row up from something ...
0
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1answer
130 views

Query multiple rooms with different conditionals (Adults, Children)

I have a simple query where I select available x Rooms with x Adults + x Children per hotel that matches a date range, but I'm having a hard time trying to figure out how to query a list of rooms per ...
2
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2answers
65 views

Identify unattached File Size in SQL Server

From a similar post on this forum, I have modified the below code as per comments and able to get the orphaned files in the drives. The code is : EXEC sp_configure 'show advanced options', 1; ...
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2answers
38 views

New to databases - does my ERD reflect good database design?

I'm making a database to hold data for a media player that I'm working on. Originally, I thought to use one table with the fields: {filePath,artist,title,album,track_number,length,date,artworkUrl} ...
6
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6answers
2k views

attach/detach v.s. backup/restore

I am using SQL Server 2008 Enterprise. I need to transfer the database (as a whole) to another server (to make a duplicate database to setup another test environment). I have two choices, (1) making ...
2
votes
4answers
456 views

Help understanding SQL Server 2005 execution plan

One of my stored procedure has long execution time (average around 4 to 7 minutes). Now I trying to tweak it an make it run faster. I am looking at execution plan and two things I see that using ...
6
votes
1answer
85 views

Is there a performance hit by breaking out tables into different schemas in SQL Server?

Is there any kind of performance hit when querying by placing tables in different schemas in SQL Server. For instance if I had 2 tables, Table1 and Table2, and put Table1 into the test schema and ...
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0answers
36 views

Oracle - Slow queries without prepending schema name or providing hint

I am logged in as the schema owner in Oracle 11gR2 on Linux. I have 55 million rows in table. select max(col) from table; - takes 300 seconds (index full scan) select max(col) from schema.table; - ...
14
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1answer
3k views

How to get the MAX row

In SQL Server I've always found it a pain to get the max rows for a dataset, I'm looking for a list of the methods to retrieve the max rows with some guidance on performance and maintainability. ...
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1answer
12k views

trying to turn XML into heirarchical SQL tables, can anyone provide a good explanation of two parts of this code example?

I am trying to learn how to turn XML into heirarchical SQL tables. I have found an old code snippet from a Microsoft forum which is basically what I am trying to do, but I was wondering if someone ...
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0answers
16 views

Can I add dummy rows to a crosstab query in Access? [on hold]

Is it possible to add dummy row headings to a crosstab query in MS Access when the data doesn't exist in the source table/query? I'd like to indicate that I'm aware that a category exists, even though ...
-3
votes
0answers
37 views

sql query self outer join [on hold]

I have one table name lease there is field lsid,month,amount the lsid is every month same suppose like this lsid lsmonth amount 1 30-nov-2014 50 1 31-oct-2014 100 2 ...
3
votes
1answer
2k views

How to remove known elements from a JSON[] array in PostgreSQL?

I'm facing an issue regarding using the JSON data type in PostgreSQL. I try to achieve storing a Java model denormalized in the DB. The model features lists of complex objects. Thus, I decided to ...
-2
votes
4answers
193 views

Is there a SELECT statement to subtract rows of the same column?

Column 1 is the mem_id, Column 2 is the Transaction type C and D, and Column 3 is the Amount Owed. So I want to return Column 3 "Amount Owed", but it has to be C-D in Column 2 for each member. ...
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votes
2answers
181 views

Netezza Error Record size 120000 exceeds internal limit of 65535 bytes

I have a column PARAM that has JSON data that looks like this: JSON:{"Name":"RES_InformationalIssues","StepName":"Page_1","StepData":"f601e9fe-d68a-4ed7-bbaa-f40c9cbc4d12=General Product ...
-3
votes
1answer
15 views

Query required to get data from same column [on hold]

I trying get data from table having customer colums and details column details columns having several values like, Pen,Pencil, notepad,Pins etc. I want to query customer having pen and pencil. Pls ...
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0answers
8 views

PostgreSQL query slow when using tsvector and ORDER BY despite having index

Running on a large database (around 1.5G) The following query takes about 70 seconds to run, SELECT x FROM DBText x WHERE x.status = 2 AND x.publishedTime < 4574590406397 AND x.service = ...
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0answers
19 views

Oracle SQL Statement alter index and add partition

I have an index in which I have to remove one column and reindex back for rebuild: ALTER INDEX <index_name> REBUILD; Is it possible to add partition when I rebuild an index. Partition will ...
0
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0answers
17 views

My database engine cannot see one of the drives

I installed SQL Server 2012 on a VM that has two harddrives, C and E. I can log into the Database Engine, but when I attempt to attach a database that is on E, Drive E is not available. Only Drive C ...
1
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3answers
8k views

Exporting table records to an INSERT script

I'm setting up a test environment for development and need to export some static data from tables in Production. Ideally the exported product would take the form of a script with all the required ...
2
votes
1answer
30 views

Get products of category plus all child categories till leaf nodes

We have a hierarchy which looks this: Now the problem is that most products are only connected with 1 category, which is most of the time the lowest level. I am trying to get ALL products below a ...
0
votes
0answers
15 views

Advice on MYSQL DELETE on CASCADE, UPDATE on CASCADE features

I have 2 tables called copyrigihtinfo and sourceinfo and many to many to relationship table cp_src_junction with following data. copyrightinfo table cp_pk cp_info 1 copyright (c) 1991-2000, ...
0
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2answers
38 views

Suspended query causing high CPU usage

Environment detail: SQL Server 2008 R2. I have applications running on JBoss that access the DB using JDBC driver. Issue: My online DB server was experiencing high CPU usage. Using the ...
2
votes
0answers
24 views

How to store a 64-digit key of alpha numerical values into MySQL Database

I am student studying in Database Administration (first year), one of our task requires a to design a login form for corporate and regular users. Below are the requirements for the username and ...
0
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0answers
19 views

Stored Procedure Issue in Simple Select Statement

Here is my Fiddle Here is My Table : CREATE TABLE IF NOT EXISTS `vehicle` ( `AutoID` int(11) NOT NULL AUTO_INCREMENT, `VehicleCode` varchar(20) NOT NULL, `NumberSeats` int(3) NOT NULL, ...
0
votes
1answer
28 views

How to delete row from table later than date?

I have a simple table: MyTable: -Id int primary key -Name varchar(MAX) -Deleted bit Now i want delete rows created later that 15.12.2014. But how can you see i don't have a any date columns in my ...
0
votes
1answer
10 views

How to find out who is active and locking the oracle database?

At work, we are sharing oracle credentials among many developers. Often time team runs heavy adhoc queries on the database and it is causing lot of trouble to oracle server. We are working to fix ...
2
votes
1answer
64 views

Recursive CTE to find unique slug

I have an article table where I want the slug to be unique. CREATE TABLE article ( title char(50) NOT NULL, slug char(50) NOT NULL ); When the user enters a title e.g. News on Apple, I want ...
2
votes
1answer
50 views

How do I create a partition using a bit field in SQL Server 2014

I have a table where data is archived. I need to keep this data as it is rarely viewed. Instead of moving archived data to a separate table, I wanted to create a partition on the Archived field. When ...
0
votes
1answer
12 views

storing query results in a variable in mysql and using it in another query

I have a following query which runs perfectly fine: SELECT count(*) as total,l.state as state FROM db1.table1 cd inner join db2.table2 l ON ...
1
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1answer
34 views

How do I get the count for time periods?

I have a table with the following columns. [ComputerGroupid], [Computerid], [Userid], [loginTime], [logoffTime] And my requirement is to get the table with the below information ...
0
votes
1answer
25 views

How can I create a bool column for a view based on the result of a statement?

I'm using PostgreSQL as my database. CREATE TABLE groups ( id SERIAL NOT NULL, name TEXT NOT NULL, PRIMARY KEY (id), UNIQUE (name) ); CREATE TABLE users ( id ...
0
votes
0answers
13 views

In Forward Engineering I have an error called 'table does not exist'

This is my forward engineering code. -- MySQL Workbench Forward Engineering SET @OLD_UNIQUE_CHECKS=@@UNIQUE_CHECKS, UNIQUE_CHECKS=0; SET @OLD_FOREIGN_KEY_CHECKS=@@FOREIGN_KEY_CHECKS, ...
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0answers
22 views

Query plan reads vs statistics io reads

I have a very strange problem. When I run a query with SET STATISTICS IO ON, it shows that I had a total of 183 reads. But when I look at the query plan dmv it shows I did 555,132 reads. I cleared the ...
0
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1answer
19 views

Merging 2 queries together

I have 2 query results that need merged together where periods are alike, adding a the column 'seats', using a '0' the period doesn't exist. Before: tdate period staff ...