What is the frequency of trains numbered 12671/12672?
CREATE TABLE table_21716139_1 (frequency VARCHAR, train_no VARCHAR)
SELECT frequency FROM table_21716139_1 WHERE train_no = "12671/12672"
<s>[INST] Write mssql query to answer the following question given the database schema. Schema: CREATE TABLE table_21716139_1 (frequency VARCHAR, train_no VARCHAR) Question: What is the frequency of trains numbered 12671/12672? [/INST] SELECT frequency FROM table_21716139_1 WHERE train_no = "12671/12672" </s>