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 Staff_Roles ( role_code VARCHAR(10), role_description VARCHAR(255) )
TABLE: CREATE TABLE Grants ( grant_id INTEGER, organisation_id INTEGER, grant_amount DECIMAL(19,4), grant_start_date DATETIME, grant_end_date DATETIME, other_details VARCHAR(255) )
TABLE: CREATE TABLE Documents ( document_id INTEGER, document_type_code VARCHAR(10), grant_id INTEGER, sent_date DATETIME, response_received_date DATETIME, other_details VARCHAR(255) )
TABLE: CREATE TABLE Organisation_Types ( organisation_type VARCHAR(10), organisation_type_description VARCHAR(255) )
TABLE: CREATE TABLE Research_Outcomes ( outcome_code VARCHAR(10), outcome_description VARCHAR(255) )
TABLE: CREATE TABLE Document_Types ( document_type_code VARCHAR(10), document_description VARCHAR(255) )
TABLE: CREATE TABLE Project_Outcomes ( project_id INTEGER, outcome_code VARCHAR(10), outcome_details VARCHAR(255) )
TABLE: CREATE TABLE Projects ( project_id INTEGER, organisation_id INTEGER, project_details VARCHAR(255) )
TABLE: CREATE TABLE Project_Staff ( staff_id DOUBLE, project_id INTEGER, role_code VARCHAR(10), date_from DATETIME, date_to DATETIME, other_details VARCHAR(255) )
TABLE: CREATE TABLE Organisations ( organisation_id INTEGER, organisation_type VARCHAR(10), organisation_details VARCHAR(255) )
TABLE: CREATE TABLE Tasks ( task_id INTEGER, project_id INTEGER, task_details VARCHAR(255), "eg Agree Objectives" VARCHAR(1) )
TABLE: CREATE TABLE Research_Staff ( staff_id INTEGER, employer_organisation_id INTEGER, staff_details VARCHAR(255) )

### Question ###
A pie chart for listing the number of the description of the outcomes for all projects.

### Accurate SQL ###

SELECT outcome_description, COUNT(outcome_description) FROM Research_Outcomes AS T1 JOIN Project_Outcomes AS T2 ON T1.outcome_code = T2.outcome_code GROUP BY outcome_description