Question

In SQL, say I have a table of the following layout:

id    name      age
1     george    12
2     tom       14
3     charles   19
4     henry     21
5     fiona     12
6     kate      14
...

If I discover that I’ve made a terrible inputting mistake, and that everybody is actually twice their age, is there a way to multiply the age column by 2 in one sweep instead of needing to painstakingly go through the whole column and edit each age individually (pretend I have 500 entries so manual work is out of the question).

Is there a SQL solution?

Answer 1

It’s really easy:

UPDATE table SET age=age*2