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_30133_1 (gdp_at_constant_prices__thb_trillions_ VARCHAR, current_account_balance__percent_of_gdp_ VARCHAR)

### Question ###
What is the GDP at constant prices for a current account balance of 12.8?

### Accurate SQL ###

SELECT gdp_at_constant_prices__thb_trillions_ FROM table_30133_1 WHERE current_account_balance__percent_of_gdp_ = "12.8"