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_2209 ( "ILO code" text, "Field" text, "conclusion date" text, "entry into force" text, "closure for signature" text, "Parties (April 2011)" real, "Denunciations (September 2011)" real, "revising convention(s)" text, "text and ratifications" text )

### Question ###
What was the revising convention of the field 'trimmers and stokers'?

### Accurate SQL ###

SELECT "revising convention(s)" FROM table_2209 WHERE "Field" = 'trimmers and stokers'