code:
sql"select c from t where d = $x and e = ${y + z}"
is the same as:
sql("select c from t where d = ", x, " and e = ", y + z)
code:
sql"select c from t where d = $x and e = ${y + z}"
is the same as:
sql("select c from t where d = ", x, " and e = ", y + z)