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

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177 views

Batch for PostgreSQL query

1) The pgpass.conf (of PostgreSQL) is: localhost:5432:*:postgres:mypassword I have no experience with batch and I have spent the day searching in the net. I'm using Windows - if that matters. 2) I ...
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2answers
3k views

Distinct Combination of Two Columns

I am currently trying to find distinct combinations within a table as two of the columns have a many to many relationship with each other. The data is all around backup policies being run on against ...
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77 views

HQL pagination returns same result on different pages - with SQL

We have the following query in the server (using sql): Query query = this.entityManager.createQuery( "SELECT type, id, date, amount FROM Transaction ORDER BY type ASC"); The type field ...
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1answer
100 views

Merging adjacent date intervals into a single row

Here is the scenario: If the employee transaction is continuous display as-is. if the employee got any gap display as a new row. Below is the sample table Emid Fromdate Todate ----- -------- ...
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1answer
56 views

Why we can FLASHBACK DROP table where it is DDL command and hence autocommited?

DROP and TRUNCATE both are DDL commands and both are autocommited.Then why we can recover DROP table by using FLASHBACK(unless it is purge) and why we can not recover TRUNCATED data(don't consider ...
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1answer
33 views

Problem with “not” in full text search

I don't understand why I'm getting these results with my full-text search query in SQL Server 2014. The following query returns results with "Supervisor" in the Title field and "Tokyo" in the ...
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1answer
69 views

Extend a single week's win/loss ratio calculation to a whole season

I'm quite inexperienced at SQL, and I'm trying to improve a query in a small project. The database schema looks somewhat like this. (I've reduced to relevant information, if there seems to be ...
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1answer
85 views

How to deduplicate SELECT statements in relational division?

I have a query that does a lot of duplicate work: SELECT visitor_id, '1'::text AS filter FROM events WHERE id IN (SELECT event_id FROM params WHERE key = 'utm_campaign' AND value ...
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1answer
97 views

How to merge partitions in Postgres?

I have a table that is partitioned by date on a monthly basis beginning January 1, 2014. There is significantly more rows of data in 2015 than there were in 2014 and the data in 2014 is not accessed ...
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2answers
91 views

Select Count of one table into another

I have one SQL statement as: SELECT ARTICLES.NEWS_ARTCL_ID, ARTICLES.NEWS_ARTCL_TTL_DES, ARTICLES.NEWS_ARTCL_CNTNT_T, ARTICLES.NEWS_ARTCL_PUB_DT, ARTICLES.NEWS_ARTCL_AUTH_NM, ...
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0answers
102 views

Upsert - Should I verify the row exists first, attempt an update, or try to insert first?

In a software that I'm working, I have a table with a few columns and a id. In some events in my software, I need to update some column of a record with a certain unique field (other column), but ...
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3answers
107 views

Finding “islands” of holiday periods for employees

I'm looking for some tips to find a nice solution for my problem: Let's say I have a table, where days of vacation of employees are stored. e.g. CREATE TABLE test_dates ( id NUMBER ...
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1answer
55 views

fetch data from two tables

I have two tables one for property detail and other for amenities. In amenities i have inserted data one by one means it has three column amenity_id,property_id,amenity. Now I want to get the property ...
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0answers
103 views

MS Access: Subform only displays first entry. Continuous Form follow-up question

I am new to MS Access and Database creation in general. Currently I am working on a simple employee database that can view an employee's information and can show their current (and previous) projects ...
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0answers
53 views

How to implement search for world-wide Wikipedia/OSM places with alternative-names

I would like to implement a search-backend which returns a location-aware search results of all Wikipedia / OSM place names, while recognising place names in all languages. Thus, if you search for "...
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1answer
21 views

Logins mapped to dropped database sql server

I was told to delete the logins that are mapped to a database ABC but unfortunately the database ABC has been dropped and no backups exist. Is it possible to find the logins that WERE mapped to ABC?
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2answers
293 views

Trouble with a NOT IN query

SELECT DISTINCT d.customer_id, d.date_added FROM `order` d WHERE d.customer_id NOT IN ( SELECT DISTINCT i.customer_id FROM `order` i WHERE i.date_added > '2015-02-15 14:00:00' ) ORDER ...
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1answer
124 views

Joining in query decomposition

I have a question about query decomposition and localization, as in here: When joining 3 tables (here EMP, ASG and PROJ) is there any specifiy order, when to join which table? Why ASG and EMP are ...
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1answer
430 views

How to enforce a constraint over multiple tables?

I have the following five tables: PRODUCT FEATURE PROVIDER PROVIDER_PRODUCT PROVIDER_FEATURE The logic is as follows: A generic PRODUCT can have one or more FEATUREs. There are different ...
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1answer
84 views

Feature of database-level audit in SQL Server 2012 Express edition

Like in SQL Server 2012 Enterprise edition, can we have database-level audit in SQL Server 2012 Express edition? Can we have Audit Folder in Security Tab?
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2answers
1k views

PostgreSQL “size of temporary files”

I've imported data into a new database (about 600m rows of timestamp, integer, double). I then created some indexes and tried to alter some columns (got some out of space issues), the database is ...
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2answers
95 views

How does TOPN influence a query with group by?

I have a query that looks like the following: Select t1.field1, t2.field2, sum(t1.field3) From t1 inner join t2 on t1.id = t2.id Group by t1.field1, t2.field2 It's simplified, normally there are a ...
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1answer
112 views

Inventory management in Rails

I'm creating a inventory management app in rails. I have an User Table and a Recipe table, there is also some tables with types of material (pens, sharpies, paper, and so on). Because there is a lot ...
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1answer
1k views

How to join all combinations from two tables with a common column

I have a list of suppliers who supply a list of countries. For example: Supplier A supplies to: USA France China and another list of suppliers with their suppliers' factories For example: ...
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1answer
585 views

How to insert values in junction table for many to many relationships (MySQL)?

I'm new to relational database design and I've hit a stumbling block. I have three tables... PROJECTS project_id, name, ... PROJECTS_UNDERGROUND projects_FK, underground_FK (I have both FKs setup ...
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24 views

MaxDB - Strange behaviour when selecting from a CLOB-Row

I am using "sqlcli" for Linux to write the output of the following query into a file: select clob_field from table (...) in SAPGui (original user input) the contents are displayed as: First ...
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111 views

How to manage hundreds of SQL jobs? [closed]

I work in Microsoft SQL Server database and I have to monitor and manage hundreds of SQL Jobs to see which job will execute on what day and what time. I also have to troubleshoot the failure of the ...
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1answer
35 views

Is there a query to see if all of my logins and password are moved during migration from SQL Server 2005 to 2008R2

I am trying to migrate my database from SQL Server 2005 to 2008 R2 test, I did follow back up and restore method to migrate the database, and I ran the QUERY provided by Microsoft to transfer logins ...
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2answers
138 views

MySQL: memory requirements for django app with 1 big table (460M rows)

I have created a django app that is running on virtual machine. All db tables are rather small (up to 1M rows) but recently I was asked to add a big table (460M rows). CREATE TABLE `genescorrelation` ...
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2answers
96 views

Will I need to create a pivot or can I alter this query

The following Query that I wrote is working to a point. The problem that I found is that in each pump, cable, etc can be listed in each of the part columns. Example: What I would like to get is ...
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1answer
161 views

mysql - select random rows with max 3 rows per parent id

I currently have a query that returns a maximum of 3 rows per parent_id. I want to enhance the query to return a maximum of 3 random rows per parent_id. This does not work for me at the moment as it ...
2
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1answer
148 views

Order by values with most incidence

I have a table as this example: CREATE TABLE customerEvent( customerID int NOT NULL, eventID int NOT NULL ) customerID may appear in many records. I use the following query to identify ...
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1answer
705 views

Find columns with different values compared with a reference row

My table, MARC, has more than 200 columns with WERKS (plant) as the key. Most of the entries in MARC have values that come from a reference plant. So, usually, all the 200 columns will contain the ...
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2answers
319 views

Oracle Database 12c: TNS:permission Denied (CentOS)

(This post has a similar title to another post but the underlying cause and solution are totally different.) Problem: I can't login to sqlplus as sysdba but the listener seems to start [John@...
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1answer
42 views

Identify records with one identical field, but different timestamp

I am trying to process some data, stored in an Oracle DB, for a machine learning model I am working on. My current query uses this line in the SELECT statement to identify records that have a field ...
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2answers
45 views

Combine the effects of separate delete and insert rows

How to I combine the two rows below: Date Id For_Id Type New_Value Old_Value ------------------------------------------------------------------ 2015-08-13 6 327 ...
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1answer
48 views

Automate Backup of SQL Server Database Structure

I have a data warehouse which isn't huge only about 16Gb in a Microsoft SQL Server Standard Edition 2014 database. However, now that it forms part of our production system I don't like developing on ...
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0answers
199 views

Update row value with a sub-select join

I am trying to update 1 column in all rows in a table to have an appropriate count value. Sadly, the SELECT query I am using won't let me join on a field in update table. The query looks like this (...
2
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1answer
183 views

How to fix DB2 Unsupported functionality: GENERATED BY DEFAULT

On IBM DB2 I try the following direct SQL: CREATE TABLE users ( user_id INT NOT NULL GENERATED BY DEFAULT AS IDENTITY (START WITH 1), user_name VARCHAR(16) NOT NULL, email_address VARCHAR(...
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2answers
2k views

Numeric vs Integer for a column - size and performance

I have an application which uses a PostgreSQL table. The table is very big (billions of rows) and has a column which is an integer. The integer can be up to 6 digits, i.e. 0-999,999 , no negatives. ...
3
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1answer
131 views

Display non-null and null count using case statement

In total there are 10 values in my table, 5 of which are null. I need to display the count using case statement in Oracle, like output below: Sample Data: +------+ | Eid | +------+ | 1 | | 2 |...
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2answers
35 views

Differentiate between a row modification and add?

Any recommendations into how one can figure out which rows were solely modified from an existing row (edit) and which one were solely inserted? I know minus can extract any rows that were modified ...
2
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0answers
68 views

Finding the most recent event older than 60 days [closed]

I would like to filter rows in a table for the most recent event for particular individuals that did not occur within the last 60 days: Select pid, Max(date) as date FROM table WHERE date ...
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2answers
548 views

Count rows with inner joined tables

I have 3 tables: Players: mysql> SELECT * FROM players; +-----------+---------+----------------------+----------------------+-----------------+------------------------------+------------------...
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0answers
107 views

SQL Server 2012 memory issue [closed]

I am having performance issues on a Windows 2012 Server running SQL 2012. When I run the DBCC MEMORYSTATUS command I receive the following. Process/System Counts Value Available Physical Memory ...
2
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0answers
69 views

How can I organize complex queries?

I am analysing a relatively large (25GB compressed MySQL dump) static data set. Some of the queries I'm writing are several tens of lines long, which makes them difficult to understand, modify, and ...
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1answer
125 views

How to add DATETIME value for session user

I am maintaining two tables: Employee table consists of username and password(for logging in) log table consists of login and logout time for the session user With the click of a button, I should ...
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2answers
5k views

INSERT… ON DUPLICATE KEY UPDATE not working as I expect

I have a table called "Example" CREATE TABLE IF NOT EXISTS `example` ( `id` int(11) NOT NULL AUTO_INCREMENT, `a` int(11) NOT NULL, `b` int(11) NOT NULL, `c` int(11) NOT NULL, PRIMARY KEY (`...
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1answer
59 views

json_array_elemnts() in FROM in postgresql 9.3 acting as where clause

I am trying to extract array out of json in the FROM statement But issue occurs when certain json doesn't have that array in it and then query just ignores that row and doesn't get counted in the ...
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2answers
332 views

Use array expression from subquery in ANY() condition

I have a relatively complicated query with a subquery fetching an array like so: ... ARRAY(SELECT category_id FROM category_schedule_con con WHERE s.id = con.schedule_id ORDER BY category_id) ...