Recent questions tagged MySQl

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mysql - Select all where [first letter starts with B]

This is a follow up question to my previous one. I want to write a MYSQL statement that echoes every entry that ... one with misc (numbers etc) See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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mysql - How do I Alter Table Column datatype on more than 1 column?

For example: ALTER TABLE webstore.Store MODIFY COLUMN ( ShortName VARCHAR(100), UrlShort VARCHAR(100) ); The above ... I am using MySql 5.x See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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mysql - design database relating to time attribute

I want to design a database which is described as follows: Each product has only one status at one time point. ... above? Thanks for any help See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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mysql - PHP database connection class

I am trying to get a users ID from a database within a class, but I have very little to no ... greatly appreciated! Thanx in advance! See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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mysql - Join multiple columns from one table to single column from another table

I'm trying to learn how to join multiple columns from one table to a single column from another table. This is my table ... | teamD | 3 | 4 | See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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486 views

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mysql - Does it make sense to use an index that will have a low cardinality?

I'm mainly an Actionscript developer and by no means an expert in SQL, but from time to time I have to ... low cardinality. Thanks in advance. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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mysql - How do I store orders?

I have an app which has tasks in it and you can reorder them. Now I was woundering how to best store them ... get deleted due to them being done See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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mysql - include Jfactory class in an external php file, Joomla

I am writing a module for Joomla, at this point I really need to be able to connect to the database using ... someone review this? thanks :) See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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mysql - SQL_NO_CACHE does not work

The first time I run this sql, needs 39 seconds,when I run again and increase SQL_NO_CACHE,does not seem to take ... row in set (0.00 sec) See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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mysql - How do I add a check constraint in a Rails migration?

I need to add a new integer column to an existing table in my Rails app. The column can only have ... this constraint within a Rails migration? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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564 views

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mysql - Difference between "int" and "int(2)" data types in my sql

Just I wonder why the range is given with the my sql data types. I define a table with a field name "id ... giving the range. Thanks in advance. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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mysql - how to sort order of LEFT JOIN in SQL query?

OK I tried googling for an answer like crazy, but I couldn't resolve this, so I hope someone will be able to ... be ordered by carPrice, DESC ? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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mysql - How should unix timestamps be stored in int columns?

I have a logging table that will contain millions of writes for statistical reasons. All the columns are int foreign ... in a signed MySQL int. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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729 views

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mysql check collation of a table

How can I see what collation a table has? I.E. I want to see: +-----------------------------+ | table | collation ... -------------------------+ See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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mysql - Finding Cities within 'X' Kilometers (or Miles)

This may or may not be clear, leave me a comment if I am off base, or you need more information. Perhaps ... Open to any suggestions also! :) See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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910 views

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mysql - Grant privileges on several tables with specific prefix

I'm using the table prefix method for having several clients use the same database. The number of tables created ... ' IDENTIFIED BY 'password'; See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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676 views

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mysql - How to produce phantom reads?

Using "repeatable read" it should be possible to produce a phantom read, but how? I need it for an example ... large table? Or something else? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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636 views

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mysql - WHERE clause before INNER JOIN

If I have SELECT * FROM Table1 t1 LEFT JOIN Table2 t2 ON t1.id = t2.id WHERE t1.user='bob'; Does the WHERE ... it so it runs prior to the JOIN? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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509 views

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mysql - Counting the number of queries performed

I'd like to test that a certain piece of code performs as few SQL queries as possible. ActiveRecord::TestCase seems ... in a block of code? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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634 views

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mysql - Get the sql query result without the table format

Like --disable-column-names option, do we have an option to get the sql query without the table format? example: ... table format ] A B C D See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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636 views

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mysql - Ruby: mysql2-Gem not working (Mac OS X Snow Leopard, Ruby 1.9.2)

I just compiled ruby and installes rubygems, mysql2 and rails, which worked quite well. But I get the following ... MySQL or the ruby-code? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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648 views

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mysql - Joining InnoDB tables with MyISAM tables

We have a set of tables which contain the meta level data like organizations, organization users, organization ... would be greatly appreciated. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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753 views

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mysql - Copy row but with new id

I have a table "test" with an auto incremented id and an arbitrary number of columns. I want to make a ... it just updates the existing row. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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710 views

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mysql - Change the stored procedure definer

I have a around one hundred stored routines in my MySQL database with with most of them have 'root' as the definer. ... ' user and not as 'root' See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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mysql - Job for mysqld.service failed See "systemctl status mysqld.service"

Console says [root@ip-172-31-18-2 mysql]# service mysqld start Starting mysqld (via systemctl): Job for mysqld. ... =/var/run/mysqld/mysqld.pid See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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742 views

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mysql - CURRENT_TIMESTAMP in milliseconds

Is there any way to get milliseconds out of a timestamp in MySql or PostgreSql (or others just out of curiosity) ... the DATEDIFF from the era? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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708 views

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mysql - Why are 2 rows affected in my `INSERT ... ON DUPLICATE KEY UPDATE`?

I'm doing an INSERT ... ON DUPLICATE KEY UPDATE for a PRIMARY KEY in the following table: DESCRIBE users_interests; ... 1 Changed: 1 Warnings: 0 See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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601 views

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mysql - Get last distinct set of records

I have a database table containing the following columns: id code value datetime timestamp In this table the only ... My database is MySQL 5. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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