How to check the number of fields in a Hive table?

To find out how many fields are in a Hive table, you can use the DESCRIBE command. This command is used to display the metadata information of the table, including table name, column names, data types, and more.

Below is an example of viewing Hive table columns using the DESCRIBE command.

DESCRIBE table_name;

Replace the `table_name` in the above query with the name of the table whose fields you want to view. After running this query, the results will include all information about the fields of the table, such as field name, data type, and remarks.

Additionally, if you only need to retrieve the number of fields without requiring detailed field information, you can use the SHOW COLUMNS command. This command is used to display the column information of a table.

Here is an example of using the SHOW COLUMNS command to view the number of fields in a Hive table:

SHOW COLUMNS FROM table_name;

Similarly, replace the `table_name` in the above query with the name of the table whose fields you want to view. After executing this query, the results will only return the number of fields in the table.