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 TRANSACTIONS ( investor_id VARCHAR, share_count INTEGER )

### Question ###
Show the average share count of transactions for different investors.

### Accurate SQL ###

SELECT investor_id, AVG(share_count) FROM TRANSACTIONS GROUP BY investor_id