node js api sql: 'insert into registration(firstName,lastName,gender,email,password,mobile)values(NULL,NULL,NULL,NULL,NULL,NULL)' code example

Example: insert to first table if field A equals field B from a second table using sql

UPDATE Table_1 SET Field_X = (SELECT Field_Y FROM Table_2 WHERE Table_1.Field_A=Table_2.Field_B LIMIT 1)