When you store data in a table, as you have learned so far, you can just enter the values and save it. The data is then saved into the table. As long as the values you enter match the type of column, then it should work. This means you can’t enter a text value into a number column, for example.
Your sample data looks like this so far:
ID LAST_NAME SALARY
1 JONES 20000
2 SMITH 35000
3 KING 40000
4 SIMPSON 52000
5 ANDERSON 31000
6 COOPER NULL
7 NULL NULL
Looking at this table, you may assume a few things:
The ID number ...
