single
Return the single element, or throws an exception if the sequence is empty or has more than one element.
The operation is terminal.
inline fun <E : Any, T : BaseTable<E>> EntitySequence<E, T>.single(predicate: (T) -> ColumnDeclaring<Boolean>): E(source)
Return the single element matching the given predicate, or throws exception if there is no or more than one matching element.
The operation is terminal.
