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

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The best way to query a partitioned table in Oracle

I have a table in an Oracle database, partitioned by a field. In our application we need to query data that is scatered across 2 partitions. Can you please tell me which method is better: making ...
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1answer
551 views

Backup the whole SQL Server databases in one .bak file - SQL Server 2005

First I asked my question here: Migrate all databases from one SQL Server 2005 to another Many friends replied to it and I gathered lots of useful information. I have another scenario in which we ...
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44 views

SQL: Repair With Keycache

Now my MySQL server running a REPAIR TABLE, table is almost 15gb size. Status - Repair with keycache. How I can restart REPAIR TABLE with normal (repair with sort) mode?
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Subquery or multiple left joins, or both?

I have two tables, for simplicity table1, with id as Primary key, and a field name, and table2 with the same. Each table has quite a few records, but during a complicated form process, the user is ...
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72 views

How much should I care about prepared statements for simple queries?

I wonder how much I should care about prepared statements (and therefore try to optimize my code) in case of pretty simple statements. The question originates from the fact that I recently noticed ...
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1answer
155 views

SQL: SOS: MySQL indexes overloads disk

My server is down now, 'couse indexes of 84GB DB are overloads disc. Here is output of df-h: /dev/ploop58097p1 193G 187G 16M 100% / tmpfs 2,0G 0 2,0G 0% /lib/init/rw ...
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1answer
120 views

If I assign a NVL constraint to a nullable column will it display an error or it will retrieve the records?

I have a database in which some tables have to be joined to fetch the data. The problem is that in one table the column is nullable (nullable is set to yes or no constraint given for that column) and ...
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35 views

Set of datetime versioned rows, how to build the most up to date row

I created this SQL fiddle with the sample data The sample data is this: -- -- Table structure for table `dogs` -- CREATE TABLE IF NOT EXISTS `dogs` ( `version_stamp` datetime NOT NULL, `dog_id`...
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64 views

MySQL Case problem

I am trying to run a SQL code (I use MySQL). What I want to do is to set DATE_REACT a value when the first condition is satisfied, and a different value when the first condition is not satisfied. The ...
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195 views

pgAgent does not run

I referred this to set up a scheduled job and did everything as it mentioned(ran the pgagent.sql as well) I need a very simple task to run periodically. In the 'Definition' tab in the steps, few ...
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3answers
4k views

Alternatives for a LEFT OUTER JOIN query

Problem I have a SQL statement with an LEFT OUTER JOIN which works fine on our Microsoft SQL Server. My problem is that i have to be compatible with H2 Database and this one got a bug with OUTER ...
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Are RANK() and DENSE_RANK() deterministic or non-deterministic?

According to official Microsoft BOL DENSE_RANK is nondeterministic (RANK()). But according to Ranking Functions by Itzik Ben-Gan "... the RANK() and DENSE_RANK() functions are always deterministic". ...
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1answer
62 views

Options for Index Defragmentations For Critical Tables

I wonder if this is a suitable solution for index defragmentations. scenario is like this; There is a table named 'Events' which is very critical and has 4 indexes which are not done maintenance ...
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6k views

Many to Many and Weak Entities

I have an entity that cannot exist without being defined by another, and I want this entity to participate in a many-to-many relationship. Example: An artist has an album (the album cannot exist ...
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2answers
9k views

convert nvarchar to int

I have a table in access linked to SQL.I am doing a query where I am using a field named comment from this table. The field is designed in SQL as nvarchar(255) . I am writing integers numbers in this ...
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1answer
239 views

Use serial ID for multiple columns and return it from INSERT

I am using Npgsql and I want to be able to do an insert, and if statement that will do an update and then return a value so when ExecuteScalar is called it reads that value. This was done fine in ...
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89 views

Querying MySQL, duration increases 10x fold after adding one more Join

I have a somewhat complicated query consisting of many joins on an issue tracker/project management database in MySQL. My issue is that my query was doing OK while I was in the process of building it ...
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1answer
20 views

Find the number of where statements that matched in postgresQL

Right now I have a query that looks something like this SELECT id FROM products WHERE products.details->'make' = ? OR products.details->'model' = ? OR products.details->'year' = ...
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Is using a relational DB for storing votes and (accessed resources) overkill?

I am writing a forum component for a site and would like to keep track of what topics/questions a user accesses so that other topics/questions can be recommended based on said users previous choices. ...
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183 views

Select complete next row based on the current row

Hi i have a complicated condition. I have a table lets say 'Test' ID Partner Type Amount 143854 CSTC Purchase -0.81 144029 CSTC Purchase -0.69 144030 CSTC Purchase -...
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34 views

How to change the mount point for a column in postgresql table?

This is my scenario I have a table t with following columns id int link varchar(500) name varchar(20) sal text In the link column we will store the location for the pdf files(mount point) ...
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313 views

SQL “select” query for getting 0 instead of null?

In the database I have some value as null . So while fetching these null value from database it should be treated as 0 not as null. Note:- I don't want to be it done by code but from SQL query.
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How to convert Excel into Star-schema Model?

My end user gave an Excel spreadsheet with 15 columns and 50K rows out of which 5 columns are calculated and 10 are not. My data modeler has converted Excel into a single TABLE on Microsoft SQL ...
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1answer
126 views

AND operator in ORDER BY clause

While debugging some code, I stumbled into an error pretty much like the following: SELECT * FROM person WHERE family_size > 3 ORDER BY birthday AND registered=0; The error is that the AND ...
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64 views

SqlServer: can one table's PK be the FK of two table's?

I have three tables project, users and proj_user. The PK of proj_user table is the FK of project and users table's pk e.g.(project_id,user_id) My question is, is it possible if the project_id and ...
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56 views

Postgres - Combine similar queries with extra where clause

I am trying to combine a number of fairly time consuming queries into one (if possible) The database contains race-track data that records the times for laps completed by drivers (or users here), the ...
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1answer
58 views

why doesn't this parameterized sql return anything while the non parameterized one does?

I have tried to use sql parameter on one of my queries and noticed when ever i do so, it just doesn't return anything! while the none parametrized one works just fine. Why is it ? None parametrized ...
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1answer
141 views

Sum Actual in different period

I have the following table test : test is a table that contains the number of week , start and end day of each week for a month WeekOfMonth StartDate EndDate 1 2014-05-01 ...
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2answers
766 views

What is causing my Transaction log to grow

The TLOG in my SQL Server 2008 is growing faster than usual. The DB has a Full recovery model and we have a TLOG backup every hour. Can you please write me or refer me to link that describes a way to ...
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204 views

Compare sysdate month with a column data

im application developer and we are using Oracle database for this project. I never used oracle before so i want some help to build a simple query. I have a CARD table with these columns EXPIREMONTH ...
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1answer
71 views

SQL Server: compare names ignoring non-alpha

I have a database table with a text column "title". New rows are inserted all the time, and every time I would like to check for potential duplicates on this column. I define duplicate by "having the ...
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0answers
72 views

How to use join with this query? [closed]

This query is working fine, and giving the right result. In this query all columns are in one table, but now I have made some changes. Now columns named Semester and Major are in different Table (...
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1answer
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The number of copies for each table stored in physical storage

I am new to Postgres and the database field. My question is that how many copies of each table are stored in physical storage device (memory, disk and so on)? I assume we need more than one copies for ...
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2answers
525 views

Advanced search engine or server for relational database

In my current project we are storing big volume of data in relational database. One of the recent key requirements is to enrich application by adding some advanced search capabilities. In the Project ...
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2answers
184 views

Unexpected result from query based on old column value

I need to update a column and based on the old value, update a second column. After googling I came up with THIS (*nr 4) solution: copy the table to have the old value at hand. The table looks like ...
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1answer
3k views

How to find non utf8 data in mysql

Ok so I have a mysql database containing data that is input from various customers. The customers are told that their data should only be encoded as utf8 however I have become aware that this is ...
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Tsql Query speed slow due to Or within where clause, causing index scan instead of seek

I have been working on making this query work more efficiently. I found that the number of Ors within the where clause are the biggest problem within this query. This query sits in a stored ...
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1answer
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How do I select data with a case statement and group by?

I'm trying to manipulate data a little by using a case statement but can't seem to figure it out. Stops -------------------- 1Stop 1-Stop 1 stop 1 Stop 1stop 1 Stop 2-Stop Im trying to come up with:...
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1answer
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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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DB Design: Looking for Performance improvement with a Column used in all SQL Queries

I recently got added to a new ASP .NET Project(A web application) .There were recent performance issues with the application, and I am in a team with their current task to Optimize some slow running ...
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1answer
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SELECT count vs DELETE JOIN. Why/how are they different?

Can someone explain in what way these queries could be different and the results are not the same? > begin; Query OK, 0 rows affected (0.01 sec) >select count(*) from tableA a JOIN tableB ...
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2answers
3k views

PostGIS vs. SQL Server for GIS data

So I'm recently starting at a new company and have a lot of ArcGIS users who seem really keen on going forwards with a PostGIS instance to serve some data to our customers. While I don't have an issue ...
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1answer
137 views

Why isn't this index helping my InnoDB MySQL query?

I'm having trouble understanding why an index I have on one of my tables is doing nothing to help the performance of a JOIN, even when forcing the index. Here is the query: EXPLAIN SELECT * FROM ...
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665 views

Group by + Order by Behavior Explanation? [duplicate]

Suppose I have: Product(_id,Name) Provider(_id,Name) Provides(ProductId, ProviderId, Price) If I want to obtain the providers who sell the most expensive products, and whose name starts with A. ...
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2answers
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Unable to SQL => Getting content of last 7 days

I thought I was good with SQL till I was told to get the content of all 30 days. I do have a column called "connect_time" which has date and time in the following format: 2014-08-28 11:11:42 All my ...
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1answer
3k views

Alternative to sub query in MS Access

I'm looking into the possibilities for writing queries in MS Access, as my client currently uses Access and would be reluctant to move away to SQL Server. I've been using the data macros (which are ...
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Optimization suggestions for db2 materialized view

I have a view for db2 9.7 which has consolidated o/p from few tables. The view is built and it is working fine I want optimization suggestions on the view SQL CREATE VIEW XYZZ AS SELECT ...
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Creating table with foreign key and index using sqlcmd.exe and batch file [closed]

I need to create a new table in the database which also has got a few Indexes and Foreign Keys associated. The create script needs to be run using the sqlcmd.exe in a batch file. Assume in the batch ...
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Find Without primary key Table in SQL Server 2008 R2? [duplicate]

This is my query to find out primary key, foreign key in SQL Server 2008 R2: select * from information_schema.table_constraints where constraint_type = 'PRIMARY KEY' Know I need to select without ...
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452 views

pre-process, anonymize, data before creating a dump from sql-server [closed]

I would like to be able to automatically create dumps from a production machine (SQL-Server 2008R2 and up). In those dumps some data needs to be anonymized (mainly by scrambling nvarchar-fields) so no ...