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

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High CPU usage by only 4 users

New as DBA and I feel really confused with this... 4 users working, doing stuff with macros, commited_snapshot ON, 90% cpu ran sp_blitz and found that 1 query is using more than 50 plan caches... ...
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Is it possible to index serial8 type column for BTS in Informix

Trying to Index an Informix Database for Basic Text Search. One of the columns is of type Serial8. Is there a way or is it possible to index serial8 column for BTS, without changing the type of the ...
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ROW_NUMBER() window_agg rows estimation

PostgreSQL 9.4 Consider the following pretty simlpe query: EXPLAIN ANALYZE SELECT * FROM ( SELECT *, ROW_NUMBER() OVER (PARTITION BY col1, col2, col3, col4 ORDER BY date DESC NULLS LAST) rn ...
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Question on comparing two fields in Access

I'm not sure if the title is fitting as I am not 100% sure if what I am doing is correct but here goes. Here is my enrolment table, I have added a field called pass/fail as you can see which is ...
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Change login name for all objects on server

Example, I have a create a windows login DOMAIN\GROUP01, and mapped that login to a database DATABASE01 with lets say DB_OWNER permissions I want to change the login name, I went into Active ...
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101 views

Unexpected SYSDATE behavior

I have a SQL trigger which adds the old value ,new value and time of update for column based on update, insert, update or delete. To update the time we used SYSDATEand inserted record from trigger. ...
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How do I disable constraint checking during schema migration?

How do I disable FOREIGN KEY checking for the time of database schema migration? Currently I found engine-based commands like: PostgreSQL: SET CONSTRAINTS ALL DEFERRED; MSSQL: EXEC ...
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Slow query - PostgreSQL 9.2

I've got a Query that takes some time to be executed... Can you guys help to improve the total time? Thank you! QUERY: SELECT file.inode_id AS file_id, file.parent_inode_id AS ...
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38 views

Merge databases with sql only: firefox places and visits

I have two tables in each of two dbs: places: id, url (unique), visits: id, place_id, timestamp, type. I need to merge those databases: There are one main database and one "to-merge". The unique ...
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87 views

High load on server because of one query

I have one query running from last stable version of wordpress on causing high load on my centos 6.7 server I enabled slow query log thought /etc/my.cnf file to record which sql cause this problem ...
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32 views

Populate ID Field by Converting Group Name Values

This is a bit tricky to explain, but here goes. We have a System Rights database that loads system users and system rights or access levels into two different tables. The database is already built ...
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71 views

Improve lookup of 1.5 million rows

I have this table with data but we need to get all the (unique) rdx and rdy values: CREATE TABLE public.positions ( datetime timestamp without time zone NOT NULL, unitid bigint NOT NULL, rdx ...
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64 views

SQL query causes server gone away

I'm developing a database system which stores and caluclates engine performance data. I have been created a new view which selects data from several tables and calculates some values. Now I'm running ...
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How Can I Increase Performance of This MERGE Statement?

I have a INSERT INTO/MERGE statement that is part of a stored procedure that needs to be really efficient. The execution plan shows that 90% of the procedure is due to the following statement shown ...
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50 views

How to find consecutive count last 3 months count and last 6 months counts

Column names: Site_key. Billing_date ,Reason_type Things to Find: Consecutive count for last 5 months: Last 3 month Count Last 6 month Count I have to find Consecutive count for last 5 months for ...
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28 views

Changing Action on Delete to Cascade

We have a rather big database (about 400'000'000 records) in roughly 100 tables. The foreign keys in these tables are defined, so that No Action is taken, when deleting data from a table. We now have ...
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Why does SemiJoin node receive so bad statistic even after runnning ANALYZE

PosgtreSQL 9.4 I have two tables: CREATE TABLE home_transactions( id serial NOT NULL, transaction_id integer ); CREATE TABLE transactions( id serial NOT NULL, user_id, amount numeric(13,4) NOT NULL )...
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111 views

Backing up / restoring a 20GB database with images stored as binary code

Please excuse me as I am a beginner. I am trying to backup and restore a 20GB database from a SQL Server 2012 to another SQL Server 2014, but I have come across the following issues: The developers ...
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69 views

SQLite reference table question

I'm using SQLite and Python for making a sensor network database. I have a table holding the nodes: NODE, another 2 tables for sensor specification: SENSOR_TYPE ("Temperature, Humidity...) and ...
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Get a parent and the children using a child ID or the parent ID

I have a hierarchical table with 2 levels of depth – that is, parents and children. Having a parent ID, I want to extract the parent and its children. Having a child ID, I want to extract the parent ...
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50 views

Matching same unknown characters in two columns

So here is the situation. I have a database with values in columns that look something like this field_0_data1, field_0_data2, field_1_data1, field_1_data2 Is it possible to only select the columns ...
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45 views

Find the last record of group of overlapped records

I have a little dilemma with filtering out result. The result and what I want to achieve is not very trivial and I didn't find an answer anywhere after extensive search. So here is my problem: I ...
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81 views

SQL query using CTE not working after database migration

We have recently migrated an application, and in the process we have migrated from SQL Server 2005 to SQL Server 2008 R2. I have noticed that some SQL queries using CTE do not work anymore since. I ...
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88 views

Secure view on row level with custom security tables

Let's say I have a following table that lists all member of my application. CREATE TABLE dbo.Member ( MemberId BIGINT, LoginName NVARCHAR(64), SecurityRole NVARCHAR(64) ) I assume that ...
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64 views

Whats the difference between the following queries? Getting the top 3 salaries for different department

I am practicing SQL and came across this issue. I am trying to find the top 3 salaries for each department. The table structure is basic with one employee table with columns (Id,name,Salary,...
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86 views

Queries which return more than 100k rows

I have a following query SELECT * FROM table_name WHERE #3_column BETWEEN start_date AND end_date which is taking about 10 seconds on my computer to execute and returns about 180k rows. Table schema ...
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Opponent Winrate Over another opponent sql

I am trying to find the most efficient way to build a counter warehouse. shortened the tables just to needed info for question Match Table MatchId, version, type MatchParticipants matchId, ...
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117 views

MongoDB very poor query performance vs Oracle

I'm a MongoDB noob and trying to import data from an Oracle table. My Oracle table has 1 unique index on a single column, which is an id (a number - primary key). I successfuly imported data to ...
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102 views

Foreign key to a subset of rows?

I have a table of Courses and it has a foreign key to Class_ID. A class teaches several courses dividing into several terms. So, Terminal is another table, it has a foreign key Class_ID to class ...
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How does PostgreSQL compute the cost for index scan?

Consider the following plan: Index Scan using foo_c1_idx1 on foo (cost=0.00..8.38 rows=1 width=37) (actual time=0.012..0.013 rows=1 loops=1) Index Cond: (c1 = 500) Buffers: shared hit=4 Total ...
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28 views

what is getmore / cursor batch

In MongoDB world you see often getmore. For example in mongostat. What is that exactly? What would be the analogous term for MySQL/MariaDB or Oracle RDBMS?
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101 views

What would be the rule for parsing parameterized sql for Netezza to be used with nzsql?

I have a bunch of legacy parametrized SQL templates that were used by nzsql utility for Netezza. See examples here: http://queforum.com/netezza/347918-parameterized-sql-file-input-nzsql.html What is ...
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195 views

Two servers with the same exact specs taking way different times to run the same query

I have 2 servers with the same exact specs: Test Server and Production Server The same exact database with the same exact data is on both of these servers. I remote into each server using remote ...
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32 views

How to parse and display row data as Column

I'm trying to display the row data from tbl_cte as a column. The result of column1 is alphanumeric e.g : "Data1.2.3". I need to parse it and display the "Data" as the name and "1.2.3" as the version ...
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Sql query , please check whether my solution is correct?

Problem is: Consider the following relational schema: COURSES (cno, cname) STUDENTS (rollno, sname, age, year) REGISTERED FOR (cno, rollno) The bold attributed indicate the primary keys for ...
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How to copy the query results from the grids when having more text in the single column

when having more text in the single column the result is trimmed out to diffrent rows when copying to excel.This is working fine in SQL 2005 mgmt. studio but in later versions (2008,2012) the result ...
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116 views

MS Access 2010 report - SQL pivot query WHERE criteria not working

I have created a report that has a list of actions which are populated from an "Actions" table. (See Below) However, each action will have multiple updates populated from an "Updates" tables and I ...
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31 views

Can you optimise the choice of array for the Oracle IN clause

I have a table which holds timestamped streaming data for events, it can be created like: create table event_data ( event_id integer, date timestamp, ... -- other data corresponding to ...
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32 views

Can i use PGP for securing My database

I have considered TDE and cell level encryption mechanism for securing my database. but these two cannot fully satisfies my requirements.through surfing i found that PGP may help me, but it is mainly ...
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Looking for a DR-like solution to enable full data warehouse re-load while having secondary copy live

I am looking for suggestions/ideas to the following problem. We have a number of data warehouses for each of our clients (on SQL Server 2014). These data warehouses are maintained fairly fresh with ...
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204 views

Update remote MySQL database upon changes in local SQL Server database

I have a Web store running with MySQL on the remote host. And I have inventory management software using Microsoft SQL Server on my local system. I want to update product stock in the web store when ...
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How to make a query from a database with schemas to a database without schemas, and vice versa, with DBLINK in postgres

I have a DB (DB1) in postgres 9.4 who use DBLINK to query another DB (DB2), and vice versa, using views and functions. But now i have to add 2 schemes to DB1 (CLIENT1 And CLIENT2) and i want when i ...
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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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101 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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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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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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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 (...
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The target principal name is incorrect. Cannot generate SSPI context - SQL Server 2012 error

I don't understand why this error is popped up suddenly. It was working till yesterday. It is a stand alone env. Problem is when me or any user wants to connect from their machine locally it is ...
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SQL Server Profiler

I had run a SQL trace on SQL server 2008 r2 and had originally saved it to the table format. This table now resides in the database and I was wondering could I export the contents of the table to a ...
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I need to find the “rank” in a sub-set of entries

I am currently working on some sort of a highscore list. But values displayed are individual for each user, ie. limited by constraints. One constraint that I am currently working on is "being part of ...