To get the number of columns, use the aggregate function count(*) of the information_schema table in MySQL. The syntax is as follows to find the number of columns:
SELECT COUNT(*) as anyVariableName from INFORMATION_SCHEMA.COLUMNS where table_schema = ’yourDatabaseName’ and table_name = ’yourTableName’;
To understand the above syntax, let us create a table with some columns. Below is the query to create the table −
mysql> create table CountColumns −> ( −> Bookid int, −> BookName varchar(200), −> BookAuthorName varchar(200), −> BookPublishedDate datetime −> ); Query OK, 0 rows affected (0.69 sec)
Now, I have a total of 4 columns in my table 'CountColumns'. You can use the above syntax to count the number of columns. The query is as follows:
mysql> SELECT COUNT(*) as NumberofColumns FROM INFORMATION_SCHEMA.COLUMNS WHERE table_schema = 'business' −> and table_name = 'CountColumns';
The output displays the count of the column −
+-----------------+ | NumberofColumns | +-----------------+ | 4 | +-----------------+ 1 row in set (0.00 sec)
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