How to query `information_schema`?

To query the information_schema database, you can use standard SQL SELECT statements. Here are a few examples:

1. List all databases:

   SELECT SCHEMA_NAME FROM information_schema.SCHEMATA;

2. List all tables in a specific database:

   SELECT TABLE_NAME FROM information_schema.TABLES WHERE TABLE_SCHEMA = 'your_database_name';

3. Get information about columns in a specific table:

   SELECT COLUMN_NAME, DATA_TYPE, IS_NULLABLE 
   FROM information_schema.COLUMNS 
   WHERE TABLE_SCHEMA = 'your_database_name' AND TABLE_NAME = 'your_table_name';

4. Get the number of tables in a specific database:

   SELECT COUNT(*) AS table_count 
   FROM information_schema.TABLES 
   WHERE TABLE_SCHEMA = 'your_database_name';

Replace your_database_name and your_table_name with the actual names of your database and table as needed.