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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15 views

Optimize query with sql server

I have the following query .its execution took 15 min .It is too much slowly . Is there a way to optimize it ? Query SELECT Id,Fees,WeekOfMonth,CONVERT(NVARCHAR(MAX), StartDate, 103) AS ...
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2answers
102 views

Msg 2627 Violation of PRIMARY KEY constraint

trying to make a database for teams in a tv show here. but when I try and insert data into tblShowteam the following error made its appearance. Msg 2627, Level 14, State 1, Line 2 Violation of ...
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1answer
119 views

Is it possible to speed up this PARTITION BY query?

I've got a timeserie table. Each datapoint has also a statut field which indicates its providing source. I'd like to request last available datapoint as of date T but there could be several results, ...
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2answers
25 views

Complex query: find all users who rated all the movies rated by user_id='1234'

So we have the following relational schema: users(user_id, ..) movies(movie_id, ..) ratings(user_id, movie_id, rate) So, we want to find all the users who have rated all the movies which are rated ...
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2answers
19 views

PostgreSQL - summing arrays by index

I have an array of doubles column (double precision[]) in PostgreSQL that keeps half hour values for a day. So each array holds 48 values. I need an efficient query that is summing all this array ...
2
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1answer
13 views

Supertyping Inventory Transactions

I am trying to wrap all interactions with inventory items into one transactional table. Currently I calculate QoH by querying multiple fact tables (production, acquisition, shipment, return order, and ...
0
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1answer
54 views

What's faster: two UPDATEs with WHERE (in / not in) or one UPDATE with CASE?

What's best performance wise, two separate UPDATEs: UPDATE table1 SET enabled = 0 WHERE code NOT IN ( SELECT id FROM table2 ); UPDATE table1 SET enabled = 1 WHERE ...
4
votes
1answer
6k views

Split/explode comma delimited string field into SQL query

I have field id_list='1234,23,56,576,1231,567,122,87876,57553,1216' and I want to use it to search IN this field: SELECT * FROM table1 WHERE id IN (id_list) id is integer id_list is varchar/text ...
2
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1answer
616 views

View with parameters in Sybase SQL Anywhere

A view with Sybase engine cannot take parameters. Is there a way to do this?
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1answer
23 views

SQL Server data, logs, backups files in mounted foldersin C:\

I know that is a good practice to have data, logs and backups files of SQL Server in diferent disk, for example D:\ for Data files, E:\ for Logs files, F:\ for backup files. But if I want to use this ...
2
votes
1answer
1k views

“No row was updated error” in SQL 2012 - worked fine in SQL 2005 and 2008

I have a database that currently lives in SQL Server 2005. We are currently looking at upgrading to SQL 2012. I installed 2012 in a test environment (Windows Server 2012 virtual machine). Backed ...
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17 views

MYSQL Tables Join Filtering For Favorites

I am in need of some help figuring out the best way to join separate tables I am using. I am essentially trying to output a list of schools (first table in MYSQL) where one column is an empty star ...
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17 views

DB Design (SQL): Tags or Types? … combined vs. divided meta data

We have a MySQL DB for some typical biz stuff like products, companies, etc. I need to design a schema for some "types" meta data. Our primary concerns are the typical scalability, and performance. ...
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1answer
1k views

In a CASE Statement, which is faster: “WHEN [field] in (0)” or “WHEN [field] = 0”?

I'm looking at a stored proc that another guy has written and every WHEN clause is using an IN statement instead of =. My gut tells me this isn't as fast, efficient, etc. For example: CASE WHEN ...
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0answers
9 views

Ambiguous Column 'sl_no' [on hold]

I have to inner join two tables and display the last inserted record . I tried the given below code. But it generate on error "Ambiguous Column sl_no. Please help me. The code is given below: select ...
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2answers
106 views

Remove a character from a records enclosed between double quotes

I have a table in which every row have data like: 0150566115,"HEALTH 401K","IC,ON","ICON HEALTH 401K",,,1,08/21/2014 What I want is to remove every comma (,) that is enclosed between double quotes ...
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1answer
89 views

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 ...
0
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1answer
30 views

MySQL dies when trying to access a specific database

For some reason, whatever I do I cannot access one of my databases (through command line or through something like phpmyadmin). However, the application that depends on this database is not having any ...
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1answer
52 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 ...
0
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1answer
168 views

Data Analysis with MongoDB or MySQL

I have a need for processing some data in order to come up with some statistic. This is the scenario: Each user can answer several questions from the question list. They pick their answers from a ...
0
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1answer
269 views

MySQL DB structure with Main category and several nested sub categories

I am looking to create a set of fields on my webpage identical to what eBay uses on their category selection page when you are selling something. For my purposes I am doing motorcycles, power sports, ...
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2answers
64 views

Limiting read access in postgres to few rows

We have a requirement where we want to limit the maximum no. of rows that a select query can return when its done using a particular login. So basically we would like to append a limit clause to any ...
0
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1answer
63 views

GROUP BY performance

I have a query like this: SELECT HOUR(datetime) as Hour, COUNT(*) as hits, SUM(clicks) FROM visitors_log_table WHERE datetime >= CURDATE() GROUP BY Hour WITH ROLLUP It works fine. But I ...
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0answers
18 views

How to store multiple vendor data in Google Cloud SQL?

I am designing a mobile app in which I need to host my vendor data and give access to that data after analysis to only the specified users. Since I will have multiple vendors with different set of ...
2
votes
2answers
223 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
52 views

Update table from different table

UPDATE RBI.RBI_OV_F_DETAIL A SET (BRANCH_ID, BRANCH_NUMBER) = ( SELECT PRICE_BRANCH_ID, PRICE_BRANCH FROM RSE.RSE_SO_F_ORDERS B WHERE A.SOURCE_ID = ...
2
votes
2answers
855 views

Loop through all databases and remove all users

We are doing a conversion from one system to another which is requiring backup/restores. I am trying to create a process that will remove all users after the restore on the new servers as no user ...
0
votes
1answer
13 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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1answer
187 views

Validate each parent intermediary is also a parent to itself

I want to validate where each parent intermediary is also a parent to itself. So this query should return invalid parents in SELECT if table has any. I need to do is first of all get all parents ...
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2answers
20 views

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 ...
1
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1answer
27 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 ...
0
votes
0answers
34 views

SQL syntax error [on hold]

I am working with a MySQL DB. When I run the code I get the following error: Error 1064. You have an error in your SQL syntax. What am I doing wrong? UPDATE project SET STATUS = 2, REACT_TIME = CASE ...
1
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1answer
23 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 ...
2
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1answer
82 views

Update old database with SQL dump

I had to recover a database with a some months old full backup. I have however in my possession a most recent but unfortunately incomplete SQL dump for this same database done with mysqldump. Is ...
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votes
0answers
35 views

Adding numer to varchar and comparing the result with another varchar value, ORA-01722

There is an SQL Report I am working on and I need some help from the experts on this forum. The report is to find all the late comers and early going people in the place. I have to add 10 minutes in ...
0
votes
1answer
37 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 ...
0
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2answers
17 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, ...
0
votes
1answer
15 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 ...
-1
votes
0answers
24 views

Get records that have associations in other tables [on hold]

I have multiple tables such as dataset_tb, dataset_tag_tb, user_dataset_access_tb. I need to get datasets that have a specific dataset_type value in dataset_tb, in which there exists a record in ...
0
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0answers
12 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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0answers
23 views

Accessing values of dymanic cloumn

I have a table which has 16 fields whose of alternate name to city. Below is my table structure: CREATE TABLE CITY_DATA_TO_CHK ( COUNTRY_CODE VARCHAR2 (100), REGION ...
0
votes
3answers
112 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 ...
4
votes
1answer
103 views

Order by bug on SQL Server 2005 vs SQL Server 2012

I have a query generated by entity framework that returns wrong results on a SQL Server 2005 db (Microsoft SQL Server 2005 - 9.00.5000.00 (X64)) but good on SQL Server 2012 (Microsoft SQL Server 2012 ...
18
votes
3answers
592 views

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". ...
0
votes
1answer
45 views

Replication in mysql with many servers

There are 3 shops. In each of these is a mysql server. I want all servers to synchronize their date if at least one server changes the date. I read a bit of literature and realized that I need ...
0
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0answers
13 views

Recursive query to break time intervals into standard-sized parts

I'd like to write a reusable function which takes 3 arguments a timestamp start_time a timestamp end_time an array of intervals interval_array such that each interval (except the first) divides the ...
-1
votes
0answers
17 views

SQL: How to optimize a 82+GB MyISAM Database? [on hold]

I have a MyISAM DB with some content (users and admins account and thematic content). All query from PHP to my DB with mysql_ library (not mysqli!) have a mid process time 8-12 seconds, if online of ...
1
vote
1answer
41 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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0answers
7 views

MySQL Replication problem with VIEWS and “Sub-Databases”

I've got three servers that should do a master-master replication. On server 1 i got "01_maindb" which holds the master tables. I replicate this table to the two other servers without problems. ...
0
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0answers
30 views

Why Sub query needed in SQL [on hold]

WHAT IS NEED OF SUB QUERY. Instead of that we may use Joins. Give with example. Thanks in advance