If you want to use phpMyAdmin to set up relations, you have to do 2 things. First of all, you have to define an index on the foreign key column in the referring table (so foo_bar.foo_id, in your case). Then, go to relation view (in the referring table) and select the referred column (so in … Read more
For a single table update UPDATE `table_name` SET `field_name` = replace(same_field_name, ‘unwanted_text’, ‘wanted_text’) From multiple tables– If you want to edit from all tables, best way is to take the dump and then find/replace and upload it back.
Since a stored procedure is created, altered and dropped using queries you actually CAN manage them using phpMyAdmin. To create a stored procedure, you can use the following (change as necessary) : CREATE PROCEDURE sp_test() BEGIN SELECT ‘Number of records: ‘, count(*) from test; END// And make sure you set the “Delimiter” field on the … Read more
Log in to MySQL console with root user: root@9532f0da1a2a:/# mysql -u root -pPASSWORD and change the Authentication Plugin with the password there: mysql> ALTER USER root IDENTIFIED WITH mysql_native_password BY ‘PASSWORD’; Query OK, 0 rows affected (0.08 sec) You can read more info about the Preferred Authentication Plugin on the MySQL 8.0 Reference Manual https://dev.mysql.com/doc/refman/8.0/en/upgrading-from-previous-series.html#upgrade-caching-sha2-password … Read more
An Explain Plan would have shown you why exactly you should use Exists. Usually the question comes Exists vs Count(*). Exists is faster. Why? With regard to challenges present by NULL: when subquery returns Null, for IN the entire query becomes Null. So you need to handle that as well. But using Exist, it’s merely … Read more
Unlike MyISAM tables, InnoDB tables don’t keep track of how many rows the table contains. Because of this, the only way to know the exact number of rows in an InnoDB table is to inspect each row in the table and accumulate a count. Therefore, on large InnoDB tables, performing a SELECT COUNT(*) FROM innodb_table … Read more
I have been faced with this problem. The cause is your table doesn’t have a primary key field. And I have a simple solution: Set a field to primary key to specific field that suits your business logic. For example, I have database thesis_db and field thesis_id, I will press button Primary (key icon) to … Read more
I restored the table from only .frm and .idb files. Get the SQL query to create the tables If you already know the schema of your tables, you can skip this step. First, install MySQL Utilities. Then you can use mysqlfrm command in command prompt (cmd). Second, get the SQL queries from .frm files using … Read more
From the MySQL – FOREIGN KEY Constraints Documentation: If you re-create a table that was dropped, it must have a definition that conforms to the foreign key constraints referencing it. It must have the correct column names and types, and it must have indexes on the referenced keys, as stated earlier. If these are not … Read more
You need to have a full group by: SELECT `name`, `type`, `language`, `code` FROM `users` WHERE `verified` = ‘1’ GROUP BY `name`, `type`, `language`, `code` ORDER BY `count` DESC LIMIT 0, 25 SQL92 requires that all columns (except aggregates) in the select clause is part of the group by clause. SQL99 loosens this restriction a … Read more