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MYSQL QUESTIONS

Very Slow Select / Join Query for table on Itself
Very Slow Select / Join Query for table on Itself
hope this fix your issue There is no possible key because you don't have any WHERE conditions. It is running slow because of the dependent subquery which, although fast in this case, still has to be run for each record in the result (the entire table
TAG : mysql
Date : December 05 2020, 12:18 PM , By : Morketh
select the records with the highest amount
select the records with the highest amount
wish of those help Hi trying to get records from a db table according to the highest percentage of game played
TAG : mysql
Date : December 01 2020, 04:55 PM , By : Karvari Ellingson
Changing Mysql golbal variable
Changing Mysql golbal variable
I hope this helps . i think what you want is like resolve this problem and keep your server running at the same time because if you would change the variable value in the config file then you have to restart the mysql server to make this change go li
TAG : mysql
Date : December 01 2020, 04:55 PM , By : Paolo Mazzoni
How to create Effective Indexing on MySQL
How to create Effective Indexing on MySQL
seems to work fine This started as a comment Gordon Linoff's answer but is getting too long.It would be better to include fldGlobalId in the index as well - no it would not - this is counter productive for performance - it won't improve the speed of
TAG : mysql
Date : December 01 2020, 04:55 PM , By : Hopegate Software
`require': Incorrect MySQL client library version
`require': Incorrect MySQL client library version
To fix the issue you can do When I run rails server it shows errors message like this: , try this outadd in you Gemfile
TAG : mysql
Date : December 01 2020, 04:55 PM , By : PACO NAVARRO GARCIA
How to save a FirstName of a Person efficiently without duplicate entries
How to save a FirstName of a Person efficiently without duplicate entries
will help you You are looking for an extreme form of normalisation that I would classify as micro-optimisation. Most databases I know of do not go that far, but why not after all.This can be simply achieved by creating a firstname table that holds al
TAG : mysql
Date : December 01 2020, 04:55 PM , By : Menna Hamedo
Can I store my own sql query by mysql special function and execute stored query later?
Can I store my own sql query by mysql special function and execute stored query later?
Does that help If by "query" you mean "SELECT query", then you want to create views. Views essentially create a pseudo-table that you can even include in larger queries.Example:
TAG : mysql
Date : December 01 2020, 04:55 PM , By : Morteza Kardoust
MySQL comma separated field query
MySQL comma separated field query
will help you As for optimization, you can solve this by normalizing your tables.User Table
TAG : mysql
Date : November 29 2020, 01:01 AM , By : Quinn Mccarthy
Why does the same exact query produce 2 different MySQL explain results?
Why does the same exact query produce 2 different MySQL explain results?
wish help you to fix your issue Q Why does the same exact query produce 2 different MySQL explain results?A Because something is different. If not in the query, then between the two tables, or database instances.
TAG : mysql
Date : November 28 2020, 08:01 AM , By : Tahra
Suppress warning output in bash
Suppress warning output in bash
around this issue
TAG : mysql
Date : November 28 2020, 08:01 AM , By : Barry
Doctrine "on update CURRENT_TIMESTAMP" annotation (Symfony2)
Doctrine "on update CURRENT_TIMESTAMP" annotation (Symfony2)
Does that help I need to make annotation for column in my entity - "on update CURRENT_TIMESTAMP" attribute. How can I do that? , You cannot use your own column definition:
TAG : mysql
Date : November 28 2020, 08:01 AM , By : vivekanand
Designing "Friend" relationships across two mysql tables
Designing "Friend" relationships across two mysql tables
this one helps. Since the friend relationship is always two-way, you must not store two lines, but only one.
TAG : mysql
Date : November 28 2020, 08:01 AM , By : Yifan
Importing sql file using phpmyadmin in EasyPHP
Importing sql file using phpmyadmin in EasyPHP
should help you out Having wasted many hours, I have a solution so here it is.Having a look on the web I found I needed to change my config.inc.php file in the phpadmin directory as I was running EasyPHP 13.1 password slightly diff to that mentioned
TAG : mysql
Date : November 28 2020, 08:01 AM , By : Christophe Van Bourg
Easy PHP and mysql ..php cannot see database on local pc (all works on server)
Easy PHP and mysql ..php cannot see database on local pc (all works on server)
With these it helps The error messages are VERY clear. Error 1: You're using the incorrect credentials, or have forgotten to grant rights on your database to the credentials you're using.
TAG : mysql
Date : November 28 2020, 08:01 AM , By : Christopher Murphy
MySQL join optimization - bypassing filesort
MySQL join optimization - bypassing filesort
it fixes the issue still having problems optimizing a MySQL LEFT JOIN. That query takes 0.13 seconds to complete instead of 0.00 for the next (simplified one). , This version uses the right indexes:
TAG : mysql
Date : November 28 2020, 01:01 AM , By : Frog157
How to Select record with the maximum value in a GROUP BY?
How to Select record with the maximum value in a GROUP BY?
hop of those help? Hi I have a table with duplicate id's that link different tasks with the completion level of each displayed as follows: , Are you looking for
TAG : mysql
Date : November 27 2020, 01:01 AM , By : Yurek
MySQL Innodb Full text Proximity Search Gives Horrible Performance
MySQL Innodb Full text Proximity Search Gives Horrible Performance
Hope this helps The LIKE condition defeats your full-text indexes. Replace the condition
TAG : mysql
Date : November 26 2020, 01:01 AM , By : Chris Funk
MySQL best approach for db normalising, relationships and foreign keys
MySQL best approach for db normalising, relationships and foreign keys
should help you out Ok let me explain you how it would be. I made an example with two tables that you can see below.
TAG : mysql
Date : November 26 2020, 01:01 AM , By : James Whale
How to update one table based on the count value of another table while matching ids?
How to update one table based on the count value of another table while matching ids?
wish help you to fix your issue There are two tables: articles and comments. There is an association between them: each comment holds the article id it belongs to. , Try this query:
TAG : mysql
Date : November 26 2020, 01:01 AM , By : Miguel Sanchez Lopez
MAMP Pro 5.1.1-terminates MySQL when quitting
MAMP Pro 5.1.1-terminates MySQL when quitting
will be helpful for those in need After updating Mac OS from 10.14.0 to 10.14.1 the issue has ceased to be a problem.
TAG : mysql
Date : November 25 2020, 07:27 PM , By : MegTowhey
SQL - Get date of most votes cast
SQL - Get date of most votes cast
I wish did fix the issue. new to SQL, excuse the noob question , Here's one way to get the specified result:
TAG : mysql
Date : November 25 2020, 07:27 PM , By : Dev
"Fuzzier" search in mysql
"Fuzzier" search in mysql
hope this fix your issue Have a look at MySQL's full text search functions. With its natural language searches, it might be enough for your needs. InnoDB supports full text search since MySQL 5.6 (before, only MyISAM tables had this feature).If that'
TAG : mysql
Date : November 25 2020, 07:27 PM , By : Roger H
Tracing mysqld Using SystemTap
Tracing mysqld Using SystemTap
it should still fix some issue It seems that the -DENABLED_DTRACE=1 bits for mysql were not enough to actually compile in the sys/sdt.h instrumentation. If they did, you'd have seen extra data in readelf. You might try looking at the individual .o fi
TAG : mysql
Date : November 25 2020, 07:22 PM , By : Kamal
SELECT + INSERT + Query Cache = MySQL lock up
SELECT + INSERT + Query Cache = MySQL lock up
Any of those help Try to reduce the query cache size significantly. 1G is probably too big. Start with 16M or 32M and adjust the query_cache_limit accordingly (256K?) - and move your way up as the read performance increases without reaching "Waiting
TAG : mysql
Date : November 25 2020, 07:22 PM , By : Adrian Ciobotaru
SQL vs. NoSQL for medium complexity search systems
SQL vs. NoSQL for medium complexity search systems
help you fix your problem You can achieve the desired result with both SQL and NoSQL database. But the project you are talking about is more relational design. Example:- Doctor can visit multiple clinics. A patient has also related to the Clinic as w
TAG : mysql
Date : November 25 2020, 07:06 PM , By : Bae
SQL Error when creating table
SQL Error when creating table
With these it helps VARCHAR(MAX) is not supported in MySql, I think you need to specify a figure in there. I think 64k is the max.
TAG : mysql
Date : November 25 2020, 07:06 PM , By : xmasclaux
Is it possible to write a query to compare rows to other rows in same table?
Is it possible to write a query to compare rows to other rows in same table?
fixed the issue. Will look into that further Assuming that "preceding" and "following" are in the sense of the ID column, you can do:
TAG : mysql
Date : November 25 2020, 07:06 PM , By : Likhitha
Display all duplicate records based multiple columns
Display all duplicate records based multiple columns
I wish did fix the issue. This will show all pairs of records which share a first and last name:
TAG : mysql
Date : November 25 2020, 07:06 PM , By : Daniel T
summing time column in mysql
summing time column in mysql
this will help I have a column in one of my tables, which is TIME format (00:00:00). I am trying to sum the entire column and display it as same (00:00:00). , You can try like this:-
TAG : mysql
Date : November 25 2020, 07:06 PM , By : Ciprian Stanciu
InnoDB: Cannot open table
InnoDB: Cannot open table
I hope this helps you . exit Xampp server,delete the ibdata1 file in C:\xampp\mysql\data. You might want to do a mysqldump before.
TAG : mysql
Date : November 25 2020, 07:06 PM , By : coolsinus
Why is IN() considered O(logN) operation?
Why is IN() considered O(logN) operation?
Any of those help First, this statement is just not true for in with a subquery. For that, either the subquery is run for every row in the data (pre 5.6 MySQL) or a join optimization is used.Second, there are two things going on when calculating the
TAG : mysql
Date : November 25 2020, 01:01 AM , By : Vijayakumar V
Can a deadlock occur on commit?
Can a deadlock occur on commit?
To fix this issue Yes, a deadlock can occur when you execute a COMMIT. More precisely, your application may be informed of a deadlock when it executes a COMMIT. Assume you are connection A and you perform some sequence of operations. Independently, a
TAG : mysql
Date : November 25 2020, 01:01 AM , By : Bazz Khurshid
Is there a fast way to do a '%phrase%' search in any DB?
Is there a fast way to do a '%phrase%' search in any DB?
may help you . In the case of MySQL, you can create a full-text index. To put it simply, a full-text index makes partial text matches fast by indexing each word. To create an index you would write:
TAG : mysql
Date : November 24 2020, 03:41 PM , By : Sateesh Reddy
Is using an IN over a huge data set a good idea?
Is using an IN over a huge data set a good idea?
This might help you The MySQL optimizer isn't really ready (jet) to handle this correctly you should rewrite this kind of query to a iNNER JOIN and index correctly this will be the fasted method assuming t1.a and t2.x are uniquesomething like this.
TAG : mysql
Date : November 24 2020, 03:41 PM , By : KwaraSPGuru
How can I know if a table is already arranged in ascending order in MySQL?
How can I know if a table is already arranged in ascending order in MySQL?
will help you Data in a table is not arranged in any order. You have to explicitly specify an order when selecting the data. If you do not specify an order when selecting the data then the returned order is neither predictable nor reliable.
TAG : mysql
Date : November 24 2020, 03:41 PM , By : Arunprasanna S P
MySQL - Designing database for a simple game
MySQL - Designing database for a simple game
hope this fix your issue I am designing a database for a simple browser based game.
TAG : mysql
Date : November 24 2020, 03:41 PM , By : Ki Mura
Why am I getting "Host '192.168.1.220' is not allowed to connect to this MySQL server"?
Why am I getting "Host '192.168.1.220' is not allowed to connect to this MySQL server"?
To fix the issue you can do Probably you have no access rule defined for root@192.168.1.220. Then the server refuses this connection.Besides, you have to remove the restriction about the bind address in the config file.
TAG : mysql
Date : November 24 2020, 05:47 AM , By : Mark Williams
what type of password hash? possible mysql hash?
what type of password hash? possible mysql hash?
fixed the issue. Will look into that further You can't decrypt the password. MySQL passwords are encrypted using a one-way encryption function.Per the manual:
TAG : mysql
Date : November 24 2020, 05:47 AM , By : Brynt Moggach
MySQL - Using a date range vs functions
MySQL - Using a date range vs functions
hope this fix your issue Both query should be equivalent, except that the first one is able to make use of an index and it should be faster, and except the case in which created_at is not a DATE but is a TIMESTAMP.If created_at is a timestamp, you sh
TAG : mysql
Date : November 24 2020, 05:44 AM , By : Andre
Using IS NULL and COALESCE in OrderBy Doctrine Querybuilder
Using IS NULL and COALESCE in OrderBy Doctrine Querybuilder
Any of those help I basically have the following (My)SQL-Query , may be this is can help :
TAG : mysql
Date : November 24 2020, 05:44 AM , By : makkushimu
How to merge MySQL columns into one column if there are empty values in the table?
How to merge MySQL columns into one column if there are empty values in the table?
should help you out I thought it would be better if I ask you by showing images. , Presumably, you want to compare for NULL/blank/whatever:
TAG : mysql
Date : November 24 2020, 01:01 AM , By : user2957659
Cardinality Confusion
Cardinality Confusion
should help you out Your description is a little vague, but my impression is that you have three key entities: Awards GroupOfPersons Persons
TAG : mysql
Date : November 24 2020, 01:01 AM , By : user2957558
Renaming column multiple ids in SELECT
Renaming column multiple ids in SELECT
will be helpful for those in need I have a table named users with a column id and another grade_id and a table nammed grades with an id and a name. , Use ALIAS name to column Try this:
TAG : mysql
Date : November 24 2020, 01:01 AM , By : user2957532
Group all from and to messages per user
Group all from and to messages per user
help you fix your problem I was wondering if someone could help me out. I am working on a Private Message center which will make users able to send PM's to each other through front end. The inboxes are working perfectly fine, however I would like to
TAG : mysql
Date : November 24 2020, 01:01 AM , By : user2957491
How to handled the null values in WHERE IN condition in mysql
How to handled the null values in WHERE IN condition in mysql
I think the issue was by ths following , I want to include the possible values as null in where in condition in mysql query. Here is my query: But it is not displaying any values. Please suggest me how to include the null value in WHERE IN condition.
TAG : mysql
Date : November 23 2020, 01:01 AM , By : user2957357
Is it okay to update primary key field to shift a record to the top?
Is it okay to update primary key field to shift a record to the top?
hope this fix your issue No this is not a good idea.Primary keys are used for two reasons: looking up records and to allow for foreign key references.
TAG : mysql
Date : November 23 2020, 01:01 AM , By : Zencored
Stop query through pdo
Stop query through pdo
I wish this helpful for you The main problem here is to share PID between your async request that generates the report and the script that should stop it.You can get your PID using:
TAG : mysql
Date : November 22 2020, 03:03 PM , By : user2957004
How to check whether particular value in field in MySQL exists
How to check whether particular value in field in MySQL exists
should help you out MySqlCommand.ExecuteScalar returns the first column of the first row returned by your query. This means (for your actual query) a NULL (if the username doesn't exist) or a string with the same username passed as parameter for the
TAG : mysql
Date : November 22 2020, 03:03 PM , By : YassineSIDKI
Execute a statement for every table in a database
Execute a statement for every table in a database
With these it helps I have written this procedure to execute statements for every table in a database:
TAG : mysql
Date : November 22 2020, 03:03 PM , By : ShanePK
insertion 74G data into mysql table cost more then 2 days, how to improve insert performance
insertion 74G data into mysql table cost more then 2 days, how to improve insert performance
wish help you to fix your issue What might be slowing down things significantly is the VARCHAR(50) PRIMARY KEY in two ways: The PRIMARY KEY being active during insertion slows insertion down. Normally this doesn't matter and is the desired behavior b
TAG : mysql
Date : November 22 2020, 03:03 PM , By : user2956759
Where can I see the differents "Hibernate Console Configurations" in Eclipse
Where can I see the differents "Hibernate Console Configurations" in Eclipse
I wish this helpful for you Finally i found it!I must change to Hibernate Perspective (Window -> Open Perspective -> Hibernate) and show Hibernate Configuration View (Window -> Show View -> Hibernate Configurations) from there.
TAG : mysql
Date : November 22 2020, 03:03 PM , By : user2956726
MySql | relational database vs non relational database in terms of Performance
MySql | relational database vs non relational database in terms of Performance
I hope this helps you . Foreign keys are basically used for data integrity.Of course, indexing boosts performance.
TAG : mysql
Date : November 22 2020, 10:56 AM , By : user2956705
Exporting mysql database using mysqldump including procedures
Exporting mysql database using mysqldump including procedures
Any of those help Try this.mysqldump -u mysqluser -p mysqlpassword --routines databasename > /tmp/databasename.sql
TAG : mysql
Date : November 22 2020, 10:56 AM , By : user2956436
Trigger MySQL not working
Trigger MySQL not working
will be helpful for those in need In trigger you can directly access the fields of main table using new or old objects.Try this:
TAG : mysql
Date : November 22 2020, 10:56 AM , By : user2956418
How do I update values for individual rows quickly?
How do I update values for individual rows quickly?
To fix this issue Don't use a single query. That's just asking for trouble. It's not hard to use Excel to create several queries.Since you neglected to supply the actual schema for your table, I'm assuming the name is smf_works_works, that id_work is
TAG : mysql
Date : November 22 2020, 10:54 AM , By : user2956354
MySQL join query with multiple where condition
MySQL join query with multiple where condition
With these it helps I have 3 tables. I need to join those 3 and get 2 fields from each table. And there will be few where conditions. Where condition is for date range. Even if one table has the the result I need to show it along with other table dat
TAG : mysql
Date : November 22 2020, 10:54 AM , By : Karanja
MySQL stored procedure is not working
MySQL stored procedure is not working
will be helpful for those in need Rename your input parameter to make it clear to the DB engine when you mean the parameter and when the column name.
TAG : mysql
Date : November 22 2020, 10:54 AM , By : user2956200
MySQL - Order By exact match at the end
MySQL - Order By exact match at the end
To fix this issue you can use multiple values in the order by , the first clause will make the Other to appear at the end
TAG : mysql
Date : November 22 2020, 10:48 AM , By : Sandy1729
Select max date or null date from same table MySQL
Select max date or null date from same table MySQL
wish of those help I would to select the max date or null but display twice for the Company Code. , UPDATEDPlease try the corrected version:
TAG : mysql
Date : November 22 2020, 10:48 AM , By : henrikdetjen
Best solution workaround for needing a mysql event on insert?
Best solution workaround for needing a mysql event on insert?
To fix this issue To address the problem of updating or deleting related entries from the event table, just create a foregin key to the programmed_delivery table.Indeed it is not possible to manage events from a trigger, but a single "master" event c
TAG : mysql
Date : November 22 2020, 10:48 AM , By : sr33kanth

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