Duplicating a MySQL table, indices, and data
To copy with indexes and triggers do these 2 queries: To copy just structure and data use this one: I’ve asked this before: Copy a MySQL table including indexes
MySQL
Create a new database with MySQL Workbench
Launch MySQL Workbench. On the left pane of the welcome window, choose a database to connect to under “Open Connection to Start Querying”. The query window will open. On its left pane, there is a section titled “Object Browser”, which shows the list of databases. (Side note: The terms “schema” and “database” are synonymous in … Read more
SQL Query Where Field DOES NOT Contain $x
What kind of field is this? The IN operator cannot be used with a single field, but is meant to be used in subqueries or with predefined lists: If you are searching a string, go for the LIKE operator (but this will be slow): If you restrict it so that the string you are searching … Read more
ERROR 1396 (HY000): Operation CREATE USER failed for ‘jack’@’localhost’
Try doing a FLUSH PRIVILEGES;. This MySQL bug post on that error code appears to report some success in a case similar to yours after flushing privs.
PHP Deprecated: Methods with the same name as their class will not be constructors in a future version of PHP
Solution : Rename your function name emailcomm() to __construct() Explanation: In previous versions of PHP, if PHP cannot find a __construct() function for a given class, it will search for the old-style constructor function, by the name of the class, but now old style constructors are DEPRECATED in PHP 7.0, and will be removed in a future version. You should always use __construct() in new code. Read php manual
Select from multiple tables without a join?
You could try something like this:
Setting up foreign keys in phpMyAdmin?
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
Can’t connect to local MySQL server through socket ‘/var/lib/mysql/mysql.sock’ (2)
Are you connecting to “localhost” or “127.0.0.1” ? I noticed that when you connect to “localhost” the socket connector is used, but when you connect to “127.0.0.1” the TCP/IP connector is used. You could try using “127.0.0.1” if the socket connector is not enabled/working.
Host ‘xxx.xx.xxx.xxx’ is not allowed to connect to this MySQL server
Possibly a security precaution. You could try adding a new administrator account: Although as Pascal and others have noted it’s not a great idea to have a user with this kind of access open to any IP. If you need an administrative user, use root, and leave it on localhost. For any other action specify … Read more
When to use SELECT … FOR UPDATE?
The only portable way to achieve consistency between rooms and tags and making sure rooms are never returned after they had been deleted is locking them with SELECT FOR UPDATE. However in some systems locking is a side effect of concurrency control, and you achieve the same results without specifying FOR UPDATE explicitly. To solve this problem, Thread … Read more