Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_1756264_2 (company_name VARCHAR, parent__holding__company VARCHAR)

### Question ###
How many companies have Postermobile Limited as a parent company?

### Accurate SQL ###

SELECT COUNT(company_name) FROM table_1756264_2 WHERE parent__holding__company = "POSTERMOBILE LIMITED"