How to avoid inserting the wrong data type in SQLite tables?
You can implement this using the CHECK constraint (see previous answer here). This would look like
CREATE TABLE T ( N INTEGER CHECK(TYPEOF(N) = 'integer'), Str TEXT CHECK(TYPEOF(Str) = 'text'), Dt DATETIME CHECK(JULIANDAY(Dt) IS NOT NULL) );
The better and safer way is write a function (isNumeric, isString, etc) that validates the user input...