user: Question: What was the highest number of 2009 electorates for Raisen when the consituency number was 142?
Columns: ['Constituency number', 'Name', 'Reserved for ( SC / ST /None)', 'District', 'Number of electorates (2009)']
Types: ['text', 'text', 'text', 'text', 'real']
Sample row: ['141', 'Bhojpur', 'None', 'Raisen', 153987.0]
SQL:

assistant: SELECT MAX("Number of electorates (2009)") FROM "Table" WHERE "District" = 'Raisen' AND "Constituency number" = '142';