Recent questions tagged MySQL

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I know, we can not rename a column using modify column syntax,but can change column syntax. My question is ... column instead of modify column? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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899 views

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mysql - Unserialize through query at database level itself

I have a column value stored in the database as: a:2:{i:0;s:2:"US";i:1;s:2:"19";} I want to ... it with php, just for the joined data. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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478 views

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mysql - Storing statistical data, do I need DECIMAL, FLOAT or DOUBLE?

I am creating for fun, but I still want to approach it seriously, a site which hosts various tests. With ... or not suitable for this site. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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631 views

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mysql - SQL WHERE condition is not equal to?

Is it possible to negate a where clause? e.g. DELETE * FROM table WHERE id != 2; See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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572 views

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mysql - CakePHP - get last query run

I want to get the last query CakePHP ran. I can't turn debug on in core.php and I can't run the ... ->ModelName->lastQuery); Thanks in advance. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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836 views

1 answer

mysql - Delete all rows with timestamp older than x days

I want to delete all the rows with timestamp older than 180 days from a specific table in my ... search_date 660779 car games 1390052553 See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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586 views

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mysql - Multiple Table Select vs. JOIN (performance)

When selecting from multiple tables in MySQL, both of the following queries return the same result set. Is one of these ... (...) LIMIT 0,10; See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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989 views

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mysql - GROUP BY having MAX date

I have problem when executing this code: SELECT * FROM tblpm n WHERE date_updated=(SELECT MAX(date_updated) FROM ... above? Thanks in advance. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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621 views

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mysql - How to Generate Random number without repeat in database using PHP?

I would like to generate a 5 digit number which do not repeat inside the database. Say I have a table ... check number into table and generate. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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524 views

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mysql - Which DATATYPE is better to use TEXT or VARCHAR?

This question is based on two things performance and size Which DATATYPE is better to use TEXT or VARCHAR? ... affect and which will impove? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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497 views

1 answer

mysql - How do I save PHP session data to a database instead of in the file system?

I have two websites, One is TLS and one is not, both are for the same client but I need the websites to ... reported. Why doesn't it work? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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509 views

1 answer

mysql - how to use a like with a join in sql?

I have 2 tables, say table A and table B and I want to perform a join, but the matching condition has to ... join. Does this make sense? Thanks. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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709 views

1 answer

mysql - Is there a way to use ON DUPLICATE KEY to Update all that I wanted to insert?

I know that you can use ON DUPLICATE KEY UPDATE to update a certain value if there is a record for that ... out the columns and values twice? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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767 views

1 answer

mysql - Minimum GRANTs needed by mysqldump for dumping a full schema? (TRIGGERs are missing!!)

I have a MySQL user called dump with the following perms: GRANT USAGE ON *.* TO 'dump'@'%' IDENTIFIED BY ... for doing the full dump correctly? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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460 views

1 answer

mysql - How does "do something OR DIE()" work in PHP?

I'm writing a php app to access a MySQL database, and on a tutorial, it says something of the form mysql_connect ... think I've seen it before. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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471 views

1 answer

mysql - Database returned an invalid value in QuerySet.dates()

I get this error on my Ubuntu 12.04 machine with mysql 5.5 after I imported some Wordpress content to Mezzanine ... your help to resolve it. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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674 views

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mysql - Error when trying to install app with mysql2 gem

Im trying to install an open source rails 3.2.21 application that uses the mysql2 gem, but when i try and run ... to get this up and running? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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530 views

1 answer

mysql - What does SQL clause "GROUP BY 1" mean?

Someone sent me a SQL query where the GROUP BY clause consisted of the statement: GROUP BY 1. This must be a typo ... that this must be a typo? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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751 views

1 answer

mysql - How to import large sql file in phpmyadmin

I want to import a sql file of approx 12 mb. But its causing problem while loading. Is there any way to ... it without splitting the sql file ? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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768 views

1 answer

mysql - How long is the SHA256 hash?

I'm going to run SHA256 on a password + salt, but I don't know how long to make my VARCHAR when setting ... database. What is a good length? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

552 views

1 answer

mysql - ALTER TABLE ADD COLUMN takes a long time

I was just trying to add a column called "location" to a table (main_table) in a database. The command I run was ... I am not sure what to do. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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587 views

1 answer

mysql - I want to copy table contained from one database and insert onto another database table

I want to copy a table's schema as well as the data within that table to another database table in another database ... . How could I do this? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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519 views

1 answer

mysql - Linux shell script for database backup

I tried many scripts for database backup but I couldn't make it. I want to backup my database every hour. I added ... /null 2>&1 will be added. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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419 views

1 answer

mysql - Database: Best performance way to query geo location data?

I have a MySQL database. I store homes in the database and perform literally just 1 query against the database, ... receive. Thanks in advance. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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467 views

1 answer

mysql - Copy values from one column to another in the same table

How can I make a copy values from one column to another? I have: Database name: list -------------- ... | 232344 What MySQL query should I have? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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504 views

1 answer

mysql - How to determine which database is selected

After calling mysql_select_db to grab a database, is there any way to later output the name of the database that ... "no database selected"). See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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572 views

1 answer

mysql - Easiest way to copy a table from one database to another?

What is the best method to copy the data from a table in one database to a table in another database when ... access database2 only. Any idea? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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828 views

1 answer

mysql - mysqldump data only

I am looking for the syntax for dumping all data in my mysql database. I don't want any table information. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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