MySQL : Open-Source, Relational Database Management System

learn more… | top users | synonyms

0
votes
0answers
16 views

MySQL: Capture every 5 values from column a in Table A to create one row in Table B

I have submissions of a form from a web page records in a database. the table has the following schema submit_time form_name field_name field_value field_order file the form has 5 fields, ...
0
votes
0answers
10 views

Avoid slow query from slowing down the site [on hold]

I have a slow select query which I optimized and still takes 3 minutes. It does not lock any tables it uses. But at the same time the tables are been used by other queries which slows down the ...
2
votes
1answer
14 views

Geo localized database RTREE

I'm using MYSQL V5.6.24 GPL I have a database with 200K rows and growing and I'm trying to get the nearest, based on points. I have all the database in InooDB, and to use Spatial data, I create one ...
0
votes
0answers
12 views

How to do updates on all rows at every button click [migrated]

I have a python app that has an admin dashboard. There I have a button called "Update DB". (The app uses MySQL and SQLAlchemy) Once it's clicked it makes an API call and gets a list of data and ...
0
votes
1answer
20 views

Sumed all which has been summed [duplicate]

Is it possible to sum all row which has been summed? For instance I have this query: SELECT SUM(registered) AS `totalOftheDay` FROM table WHERE DATE(ds.register_time) BETWEEN '2015-03-01 ...
2
votes
2answers
165 views

MySQL - How to check whether all values of a given SELECTed row are equals? [on hold]

Using MySQL, how can i SELECT all rows whose values are equals ? For instance, suppose a SELECT of a given table as follows COLUMN_A COLUMN_B COLUMN_C ... COLUMN_N 1 2 4 ...
0
votes
1answer
14 views

Student Attendance, null not returning [on hold]

My question is based on the answer given here Attendance: id | student_id | date | ------------------------------ 1 | 2 | 2013-10-24 | Students: student_id | student_name | ...
2
votes
2answers
62 views

How to interpret correlated subqueries?

EDIT: Both answers are great but I think I must clarify my question. NOTE: I must indicate that in the following, by executed, I mean logically. I understand that the actual execution made by the ...
0
votes
1answer
11 views

Gotchas converting latin1_swedish_ci to utf8mb4_unicode_ci

I have a MySQL 5.5.31 database which has approx 220 tables - of these 220 tables, around half of them are already using utf8mb4_unicode_ci but the "older" tables are still using latin1_swedish_ci. The ...
-4
votes
0answers
16 views

stored procedure not working

i am running this one on mysql phpmyadmin. DROP PROCEDURE `gettree`// CREATE DEFINER=`root`@`localhost` PROCEDURE `gettree`(in team_id bigint) BEGIN declare count bigint; declare tmp_team_id ...
1
vote
1answer
33 views

updating same column as in the select query

When I try to do this, I get an error saying I cannot use the same table in where select as the column that I am updating. UPDATE table_name SET quantity = 19 WHERE productID = 148357 ...
0
votes
1answer
23 views

InnoDB Table has backed up INSERT and UPDATE queries, high CPU

I am running an MySQL DB with all InnoDB tables. I often have many queries backed up for the same table when I run SHOW PROCESSLIST; Basically, I keep a table of every logged in customer and update ...
0
votes
2answers
64 views

Query that was working on MySQL is not working on PostgreSQL

I had the following query (with bin_number being a string) which was working on MySQL 5.5: Postgres - was working on MySQL and doesn't work on PostgreSQL SELECT "menu_items".* FROM "menu_items" ...
5
votes
1answer
620 views

SQL Query challenge

I have what seemed like an easy query to write, that really has me stumped - can anyone help me please? So this is really easy on paper, but I can't translate it into SQL. Lets say you have some ...
0
votes
1answer
47 views

Get the latest record and count them with time interval

I have a table as below id fk_sales_id status created_at 1 001 5 2015-02-17 16:45:44 2 001 8 2015-02-18 18:45:44 3 002 30 2015-02-20 16:45:44 ...
0
votes
0answers
20 views

I want to rewrite my MySQL query so that FIND_IN_SET doesn't do a full table scan unless necessary

I want to rewrite my MySQL query so that the last table join doesn't do a full table scan unless necessary. Here's what I mean. Under certain conditions I don't need to select any rows in that join ...
0
votes
1answer
24 views

sql query for hierarchal search [on hold]

In the below relational table, I want to search all user id's whom are are under any particular sponsorid in hierarchical manner User Id Name Sponsor Id 10030080 TULSI RAM ...
0
votes
0answers
11 views

MySQL Server Install Setup Types Developer Default vs Full

As I'm installing MySQL Server Community Edition the possible Setup Types are: Developer Default Server Only Client Only Full Custom Is there any difference between options Developer Default and ...
-2
votes
1answer
22 views

How to implement a distributed database system [on hold]

I have been tasked to find out how to implement a distributed database system using the various database management software available like: MS Access 2013, MySQL and PostgreSQL. How would I be able ...
0
votes
1answer
31 views

combining two different record into single result

I am fetching data from 3 tables with the help of join. My output is in JSON format. Output in JSON format:- {"order_id":"2", "location_address":"Testing location Delhi", ...
-2
votes
1answer
41 views

how many database tables is too much?

I'm working on a project for a school and so far I have 91 tables! Everything is linked to the student table, is it normal to have this many tables in one database? or do i need to make multiple ...
0
votes
0answers
18 views

Export MySQL query log to JSON format

Is there any tool which is capable of exporting MySQL query log to JSON format (or any other structured format)?
0
votes
1answer
33 views

Finding the same value in a column and only returning rows without the same value

I have a query that i have to find the DiscountPercent that are the same and not show the rows with the same DiscountPercent. I have tryd this and it brings back the values that are the same SELECT ...
0
votes
1answer
13 views

Unable to get any type of connection using mysql on LAN

My question is rather simple, I have a Windows 7 machine that is hosting an Apache server and a MySQL server using the XAMPP control panel. Both of these have been installed as a service on the ...
0
votes
1answer
43 views

How to merge two databases, both with primary keys

I have two databases, both with the same tables, but the data is out of sync. I need to add data from database A to database B, but not overwrite any data in B that exists in A, instead add it with a ...
0
votes
1answer
27 views

How to restore database from /var/lib/mysql

I have a database folder from a crashed server called gain_wordpress. I'm trying to put that database on a new server but I'm not able to do it successfully. I don't have a .sql dump, all I have is ...
0
votes
1answer
24 views

Change MariaDB 10.0.17 (MySQL) master to a slave

I have a MySQL master/slave configuration -------- -------- | master | -> | slave1 | -------- -------- I want to kill my current master, transform slave1 to be the new ...
0
votes
0answers
11 views

How to create a communication link failure in MySQL

For testing purposes I would like my MySQL server to generate a communication link failure (com.mysql.jdbc.exceptions.jdbc4.CommunicationsException). How can I tweak MySQL that this error is easily ...
1
vote
2answers
27 views

mysql - order by first condition in where clause

I have a table consists of the following fields id, name with the following values 1, ciro 2, test ciro 3, ciprox 4, other 5, other i would like to get all the values that begin with "ci" or ...
0
votes
0answers
19 views

Need a table schema for general store app [on hold]

I am Developing one application for online general store and stuck some where near making a schema for the products. Here, Every Product has brands and Product can come in multiple varieties like for ...
0
votes
0answers
14 views

Mysql cursor alternative / Optimization - each row updates are too slow

I'm looking to optimize my cursor based update or actually replacing it... Situation We're carrying out promotional campaigns and I'd like to track user activity per campaign. Logic Each campaign ...
0
votes
1answer
26 views

delete query performance issue on mysql

I have two tables table1, table2 where table2 is a subset of table1 (basically created with the query create table table2 as select * from table1 where .....) Now, I am trying to run the below query. ...
0
votes
0answers
23 views

Subquery optimization

I was reading through this article - http://explainextended.com/2009/09/18/not-in-vs-not-exists-vs-left-join-is-null-mysql/ I am working with an existing design. What I want is to be able to select ...
0
votes
1answer
22 views

Unable to get the latest value added to Mysql table based on posted time

SELECT * FROM discussion_comments GROUP BY disc_id ORDER BY posted_date DESC I have table example like given below: CREATE TABLE example ( id int(11), cname varchar(11), posted_date date, ...
0
votes
1answer
28 views

What is the performance benefit when using a temporary table to update a regular table?

I'm trying to understand what the performance benefit between two different methods of updating multiple table rows. For the first method we have an explicit update statement for each line to be ...
0
votes
1answer
16 views

Access denied to user@localhost

As a root user i did this: GRANT DELETE, SELECT, INSERT, UPDATE, EXECUTE ON dbName.* TO 'user'@'localhost' IDENTIFIED BY 'apassword'; In 'dbName' i created a procedure 'proc_name' with definer set to ...
0
votes
1answer
19 views

Optimize Query in MySQL

I've following tables with respective fields 1) wi_individual_g(ind_id,ind_is_recepient,ind_deleted,ind_district_id,...) - Around 200K data 2) wi_individual_p(ind_id,prg_id,...) Around 250K data 3) ...
0
votes
0answers
15 views

Use ID from another mysql database?

I have a mysql database for form submission (written in PHP) data and a mysql database for CRM (using X2CRM) on the same server. When a form is submitted on my website the POSTed data of the form ...
0
votes
0answers
22 views

Allow only parent DELETE cascade to delete child rows

I have a Product database with the following components: ProductOptions is a list of option names for each Product, ProductVariants is a list of variants for each Product and ProductVariantOptions is ...
0
votes
1answer
30 views

Guidance in creating a database for parks division attendance data [on hold]

We(group project) are trying to design a mysql database for our client which is a division of Off-Highway motor vehicle parks. Our client keeps tack of attendance data by month of many different ...
0
votes
0answers
13 views

Multi tenant database: Join table between 3 tables (user-role-company)

When designing a multi-tenant design i face this problem: One User can have multiple Roles, one Role can have Users (m-n) One user can be part of multiple Companies (organizations) and Vice-Versa ...
0
votes
0answers
18 views

Slave executing queries with different charset

I need to change a database charset because of this issue and I solved my issue in staging environment with the SQL command ALTER TABLE `articles` CONVERT TO CHARACTER SET utf8 COLLATE ...
0
votes
1answer
45 views

SELECT COUNT(*) expensive query mysql?

I have following query: SELECT COUNT(*) AS `numrows` FROM (`phppos_items`) WHERE `deleted` = 0 explain: mysql> explain SELECT COUNT(*) AS `numrows` -> FROM (`phppos_items`) ...
0
votes
1answer
19 views

Select range of non-identical date from different table

On MySQL5 with innoDB, I have sensor data in multiple tables, all with an ID and a DATETIME field, like so (two tables shown, but there are more). The IDs and DATETIMEs are not identical between ...
0
votes
0answers
19 views

How we resolve Mysql Enterprise online backup error with “CORRUPT LOG RECORD FOUND” log error

I have configured my production MySQL database with MySQL Enterprise "online Backup" option. The configuration was went through successfully. When the assigned scheduler is try to take backup then i ...
0
votes
1answer
26 views

how effective creating 2 database with same content?

I'm in a dilemma if creating redundant database will speed up the access considering only the CRUD factor. Is it effective to create a dedicated DB for creating/updating/deleting records and a ...
0
votes
0answers
40 views

Why is MySQL not saving inserted data?

So I have the following insert statement that I run through MySQL Workbench: INSERT INTO PeakOnlineCount (time_stamp, LocationId, Count) values ('2015-03-26', 0, 1) If I run the following query: ...
0
votes
1answer
41 views

LEFT JOIN DEFAULT NULL VALUE

I had query simplified like this : SELECT a.id, a.name, b.* FROM a LEFT JOIN b ON a.id=b.id Which b is from group concat select (very dynamic column). Sometime there are 3 column in b, sometime ...
-2
votes
0answers
13 views

Can anyone tell me which programming language is from www.freelancer.com, www.clickbank, www.craigslist.org and www.pof.com? [closed]

I want to build a site like www.pof.com and advance search area is my favor (key word post and match and searching). Any one can tell me better, simple and easy to apply and manage in the future for ...
0
votes
1answer
29 views

MySQL query where one column is equal to another [closed]

I've written the query below (that is not working as desired): update payments set payments.commission_id = ( select commissions.id from commissions where ...