Tables in a relational database have various characteristics:
1. The tuples in a relation are all distinct from one another;
2. Each tuple has the same number of attributes (i.e. columns);
3. The ordering of the tuples in a relation has no significance;
4. The ordering of the columns in a relation has no significance (although the data values must be in the correct column)
5. Each cell contains only one data value (as opposed to a set, array or list).