How to query all databases in mysql

Mysql method of querying all databases: 1. Use the MySQL client to log in to the MySQL database server; 2. Directly execute the "SHOW DATABASES;" or "SHOW SCHEMAS;" command to list all databases.

The operating environment of this tutorial: windows7 system, mysql8 version, Dell G3 computer.

To list all databases on the MySQL server host, use the SHOW DATABASES command as follows:

SHOW DATABASES;

For example, to list the local MySQL database server For all databases, please first log in to the database server as follows:

C:\Users\Administrator>mysql -u root -p
Enter password: ******
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 7
Server version: 5.7.9 MySQL Community Server (GPL)

Copyright (c) 2000, 2015, Oracle and/or its affiliates. All rights reserved.

Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

mysql>

Then use the SHOW DATABASES command:

mysql> SHOW DATABASES;
+--------------------+
| Database           |
+--------------------+
| information_schema |
| crmdb              |
| mysql              |
| newdb              |
| performance_schema |
| testdb             |
| yiibaidb           |
| yiibaidb_backup    |
+--------------------+
8 rows in set

SHOW SCHEMAS command is a synonym for SHOW DATABASES, so the following command will return the same results as above:

mysql> SHOW SCHEMAS;
+--------------------+
| Database           |
+--------------------+
| information_schema |
| crmdb              |
| mysql              |
| newdb              |
| performance_schema |
| testdb             |
| yiibaidb           |
| yiibaidb_backup    |
+--------------------+
8 rows in set

If you want to query the database matching a specific pattern, use the LIKE sub Sentence, as shown below:

SHOW DATABASES LIKE pattern;

For example, the following statement returns the database ending with the string "schema";

mysql> SHOW DATABASES LIKE '%schema';
+--------------------+
| Database (%schema) |
+--------------------+
| information_schema |
| performance_schema |
+--------------------+
2 rows in set

It is important to note that if the MySQL database If the server is started with -skip-show-database, the SHOW DATABASES statement cannot be used unless you have the SHOW DATABASES permission.

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