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_204_678 ( id number, "record" text, "athlete" text, "nation" text, "venue" text, "date" text, "#" number )

### Question ###
what is the difference between the number of times the record has been set by the czech republic and the number of times the record has been set by china ?

### Accurate SQL ###

SELECT ABS((SELECT COUNT(*) FROM table_204_678 WHERE "nation" = 'czech republic') - (SELECT COUNT(*) FROM table_204_678 WHERE "nation" = 'china'))