0
votes
1answer
255 views

how to update date field in a record to null?

I have records in a table which a field named as 'validity' contains date as '8/15/1947 12:00:00 AM'. I need to set this date as null. I am having 1000 records,in that validity field is '8/15/1947 ...
0
votes
1answer
99 views

Low-level relational operators from SQL

I have been asked to outline the sequence of commands using low-level operators (join/project/select) that are used in the following SQL statement; SELECT d.name, k.city FROM DOG d, KENNEL k WHERE ...
0
votes
1answer
276 views

How to add a column with computed columns with values of row on Sybase IQ [closed]

How to add a computed column to a table referring a field from current row at Sybase IQ 16 Here is want I want to achieve: When inserting a new row (or updating a row) I want to have a column ...
0
votes
1answer
343 views

copy table comments from one MySQL database to another

I wrote column comments in MySQL database replica made for testing. Now I need to copy these comments to production database. Since comments are stored in table COLUMNS of information_schema database, ...
1
vote
0answers
103 views

SELECT, PROJECT, CARTESIAN PRODUCT and JOIN

I have the following tables; DOG +----------------------------------------------+ | Name Type Age Kennel_name Owner_name | +----------------------------------------------+ ...
0
votes
2answers
85 views

Optimize query with indexes

The following query is looking for all towns that are between 5 and 10 kilometers from a hard-coded latitude/logitude (=another town actually). I have 37010 towns. I'm using Symfony 2 which "creates" ...
0
votes
1answer
2k views

Oracle Enterprise Manager - Where do I find the error logs?

I'm not familiar with oracle management. The problem is when I try to connect to the enterprise manager through the Web browser I get this error: In english: "Internal Error has occurred. Check ...
1
vote
1answer
139 views

SQL Server and SQL anywhere compatbility

I wish to install a SQL server DB on a VM already running a SQL anywhere DB. May I encounter a compatibility issue ?
3
votes
1answer
3k views

How can I create a Foreign Key to a Compound Primary Key with a single column?

I am working with a 'lookup' style table that is already in place, which has a compound primary key (not my design) in Microsoft SQL Server 2012. I want to add a foreign key to it in another table, ...
0
votes
1answer
39 views

Should I assimilate all address lines to a single line?

I'm new here, so I'll keep my question straight and short. I am building a webapp that lets users select some product, submit their details and place an order. Currently, my ORDER table contains only ...
1
vote
0answers
127 views

Multiple handler entries in lsnrctl services output

This what I get for an lsnrctl services. LSNRCTL for 64-bit Windows: Version 11.2.0.1.0 - Production on 04-APR-2014 10:01:43 Copyright (c) 1991, 2010, Oracle. All rights reserved. Connecting to ...
0
votes
0answers
731 views

ssis ado.net destination has failed to acquire the connection

I am Transferring data from sql server source db to sql server destination db (cross db). but some times getting error "ssis ado.net destination has failed to acquire the connection.The connection may ...
0
votes
0answers
2k views

Importing dump file contents to another DB with different schema using Oracle Data Pump

I asked this question in stackoverflow but no one was able to answer it so am trying my luck here if anyone knew what am talking about. Here is the link original question. What i wanted to do is to ...
0
votes
1answer
1k views

How to know DB size using backup file without restoring it

Is there anyway so that we can estimated/know size of database using backup file without restoring it?
3
votes
1answer
259 views

Is it possible to return a custom error for a logon trigger?

I'm trying to get a logon trigger to return a custom error. Thus far everything I have tried causes it to return the standard error: My trigger looks like this: CREATE TRIGGER Test_Logon_Trigger ...
0
votes
1answer
52 views

limiting rows in joins

So I have this problem with one of my queries. The query is meant to get data from table patients and join the table patient_nurse, then table nurses to it. The patients table is as follows id | ...
1
vote
2answers
2k views

Why Can't I find my databases from Mysql on linux?

I'm new to linux. I cannot get a list of my databases by typing SHOW DATABASES on the MySQL shell. Though this MySQL program is aware of the MySQL datadir because it is listed when I type SHOW ...
1
vote
1answer
234 views

Performance hit with column alias

I have a database in SQL Server 2008, with the final data table having about 2 million rows. The development team is implementing a new application and they have suggested changing the column name to ...
4
votes
2answers
6k views

SQL Server on Mac

Can SQL Server engine express edition be installed in a Mac OS? I use a MacBook at home and would like to use it as a testing/learning platform for SQL Server.
1
vote
1answer
385 views

How to create an index used by a WHERE extractValue(…) LIKE '…'?

Setup Let's say you have a table with some XML data. For the sake of argument, say: CREATE TABLE t_xml (xml XMLTYPE NOT NULL); INSERT INTO t_xml VALUES ('<name>Alice</name>'); INSERT ...
0
votes
0answers
53 views

Is it possible to group by a fraction of the result set?

I have a database of products with prices. What I'd like to be able to do is figure out 5 different price ranges such that each range, when ordered by price, will have approximately the same number of ...
0
votes
1answer
392 views

Minimum Permission to Restart SQL Services

Occasionally, our developers need to restart SQL services. We do not want said developers to be local admins on each server if not necessary. What is the minimum permission required so that the ...
7
votes
2answers
4k views

Improve performance of COUNT/GROUP-BY in large PostgresSQL table?

I am running PostgresSQL 9.2 and have a 12 column relation with about 6,700,000 rows. It contains nodes in a 3D space, each one referencing a user (who created it). To query which user has created how ...
5
votes
3answers
7k views

SQL Performance issue after migration from SQL Server 2005 to SQL Server 2012

Yesterday we migrated a SQL Server 2005 database to SQL Server 2012. We made a full backup and restored it on the new server. Problem now is that the database on SQL Server 2012 is much slower than ...
2
votes
2answers
414 views

Problem translating MySQL to PostgreSQL

We're using Trac for issue tracking. I migrated it from MySQL to PostgreSQL, but some of the ticket queries no longer work. In the below, all I did this far is replace IFNULL() with COALESCE() and ...
1
vote
1answer
331 views

Database Normalization: A Case Of The NULLs [duplicate]

I'm trying to learn about proper database management and am having a hard time with designing a database that doesn't rely on NULLs. If you think I'm crazy for embarking on this, it is because of SQL ...
1
vote
1answer
2k views

Why does SQlite return incorrect sum?

CREATE TABLE "Test" ("ItemQty" DOUBLE NOT NULL ); Insert Into Test VALUES (1.4); Insert Into Test VALUES (1.4); Insert Into Test VALUES (1.4); Insert Into Test VALUES (1.4); Insert Into Test VALUES ...
1
vote
0answers
40 views

Second opinion about elimination of possible redundant database column

We currently have a Widgets database table were we track the widgets the company produces. When a widget is produced the widget information is added to this table. This Widgets table contains a Status ...
1
vote
1answer
120 views

RETURN NEXT in Postgres Function

I'm currently writing a plpgsql function that will select from a table and produce a substantial amount of data. I was originally going to return an array, but I found a resource that explains the ...
1
vote
1answer
242 views

Database Design for NoSQL Fantasy Baseball League

I am trying to create a proper schema to place scraped data into, using a MongoDB database. Currently it looks like Team { id : id, name : String, teamLink : String, username : ...
1
vote
1answer
80 views

PostgreSQL: cache, disk, replication. What order?

I am thinking of using two servers in Master/Slave replication I want to add following condition: RAM size = dataset size * x, where x > 2. After that, I plan to force PGSQL to keep all data in RAM ...
0
votes
1answer
494 views

MySQL Rows to Columns to HBase (using Sqoop)

I have a table that looks like this in MySQL: id | date | num | avg I have found that I can use this for rows to columns and it works so far: SELECT CONCAT(id, '-', date), MAX(IF(`num` = ...
1
vote
1answer
137 views

select and count based on a condition

I have two tables, proj: id name and proj_reports: id, position, created_at, key_id, proj_id and I want to select from key_reports for each proj_id: `- total number of `key_id` which can be done ...
0
votes
1answer
108 views

Cassandra with Hadoop

Cassandra uses Cassandra File System (CFS) and Hadoop uses Hadoop Distributed File System (HDFS) I'm already using Pig over HDFS and i would like to install Cassandra. Having additional servers for ...
0
votes
0answers
90 views

Name for SELECT equivalent of UPSERT

UPSERT means INSERT and\or UPDATE, is there a standard name for a sproc that will INSERT if necessary and then SELECT? e.g. I want to get the IS of a row that matches fields and give me the ID, if ...
1
vote
2answers
5k views

MySQL timestamp timezone handling

Does the timestamp data type represent an instant-in-time or a year-month-date-hour-minute-second value? An instant in time is a moment, like the moment you started reading this, and it can be ...
0
votes
3answers
440 views

How do I tell the actual IOPS used by Oracle?

This is hopefully a simple question. We have a large DB deployment that we need to scale up over the next year. For scaling we have been relying on our vendor, but recent developments have caused us ...
0
votes
2answers
214 views

MySQL password is changed automatically

I'm the lone user of my computer. I haven't changed my MYSQL root user password, but it is somehow changed to empty password. Help me out ! My default sakila db is also gone. I specified ...
0
votes
1answer
236 views

Oracle 10g: same query, different plans on copies of the same DB

I have a query joining a number of long tables (primary key in one table, indexed column in another) which results in different plans on different copies of the same database. The structure of copies ...
0
votes
0answers
81 views

Create replication sql server for DWH [closed]

I have a DWH and I need to make an update once a day from STG Database to DWH I need use replication in SQL SERVER, How I do this?
0
votes
1answer
206 views

Monitoring sql server

This question is related to monitoring of SQL Server. I want to send an email alert with all open transactions on SQL Server in HTML report whenever there is sustained 50-60% CPU usage for more than ...
0
votes
1answer
119 views

sql server disk I/o question [closed]

I have a question on disks. How much I/O can a normal disk and a SAN disk can handle? I have heard about SAN disks should be able to handle upto 200-300 mb/sec, how much does a normal disk can handle ...
0
votes
0answers
263 views

MongoDB Sharding and Replica Set Allocation

I am going to setup MongoDB cluster: 3 config servers, 3 routing servers, 2 shards (replica set per shard). A replica set is just simply 1 primary, 1 secondary and 1 arbiter. Therefore, in my ...
0
votes
3answers
62 views

Should this be a foreign key? [closed]

I'm working on a school project and I need some help. I want to create three tables which should contain these fields: User UserID (AI, PK), UserEmail, UserPassword WorkGroupMember GroupID(PK, FK ...
3
votes
3answers
670 views

A little clarification on how 'LIMIT' works

Not being a full blooded member of the DBA clan, but more of a dev clan, I find myself trying to figure out some slow running queries. The subject of my question however is not 'Why my queries are ...
1
vote
2answers
3k views

Decode function in SQL Server

Can some one help me to figure out the equivalent function to decode in SQL Server. Here is the statement which I used for Oracle and I want it for SQL Server. I tried but not able to get it. UPDATE ...
0
votes
3answers
305 views

How to create an Access query to find # symbol into a field?

It seems easy but I'm missing something. I have a MySQL database that is connected from access through ODBC connector. I'm looking for the fields where there are # symbol but I'm getting zero ...
1
vote
0answers
107 views

Phantom insert query

I have a log table which I have to clean up a bit because it is growing very fast. While deleting some historical data I reached count zero for that condition on which I have deleted the entries. 5 ...
3
votes
1answer
114 views

Every query plan statistic says my query should be faster, but it is not

I have a bit of a odd situation. I have two queries that produce the same result, according to SSMS and SQL Sentry Plan Explorer the first query should cost 95% and the 2nd query should cost 5%. ...
0
votes
1answer
59 views

Last used index from specific table

how can i take last used index from a specific table and add a +1 to it? database login, table cars I think i need to add it here #### $sql = 'INSERT INTO '.$this->options['db_table'] ...

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