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_37545 ( "Name" text, "Length" text, "Tonnage" real, "Built by" text, "Year" real, "Engines" text, "Horsepowers" real, "Former Names" text )

### Question ###
Which Built by has a Name of northern jaeger?

### Accurate SQL ###

SELECT "Built by" FROM table_37545 WHERE "Name" = 'northern jaeger'