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IT Nursery > News > Database

Database

How do I specify unique constraint for multiple columns in MySQL?

I have a table: table votes ( id, user, email, address, primary key(id), ); Now I want to make the columns user, email, ...
  • April 16, 2022
  • 0 Comments

How do you set a default value for a MySQL Datetime column?

How do you set a default value for a MySQL Datetime column? In SQL Server it’s getdate(). What is the equivalant for MySQL? ...
  • April 16, 2022
  • 0 Comments

Insert into a MySQL table or update if exists

I want to add a row to a database table, but if a row exists with the same unique key I want to ...
  • April 15, 2022
  • 0 Comments

How to get the sizes of the tables of a MySQL database?

I can run this query to get the sizes of all tables in a MySQL database: show table status from myDatabaseName; I would ...
  • April 15, 2022
  • 0 Comments

MySQL error code: 1175 during UPDATE in MySQL Workbench

I’m trying to update the column visited to give it the value 1. I use MySQL workbench, and I’m writing the statement in ...
  • April 15, 2022
  • 0 Comments

How do I quickly rename a MySQL database (change schema name)?

The MySQL manual at MySQL covers this. Usually I just dump the database and reimport it with a new name. This is not ...
  • April 15, 2022
  • 0 Comments

Retrieving the last record in each group – MySQL

There is a table messages that contains data as shown below: Id Name Other_Columns ------------------------- 1 A A_data_1 2 A A_data_2 3 A ...
  • April 14, 2022
  • 0 Comments

What’s the difference between utf8_general_ci and utf8_unicode_ci?

Between utf8_general_ci and utf8_unicode_ci, are there any differences in terms of performance? 8
  • April 14, 2022
  • 0 Comments

Which MySQL data type to use for storing boolean values

Since MySQL doesn’t seem to have any ‘boolean’ data type, which data type do you ‘abuse’ for storing true/false information in MySQL? Especially ...
  • April 13, 2022
  • 0 Comments

How can I output MySQL query results in CSV format?

Is there an easy way to run a MySQL query from the Linux command line and output the results in CSV format? Here’s ...
  • April 13, 2022
  • 0 Comments

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