Question

I know when you insert a value into db, it set that column value as current datetime,
does it apply to it when you run a update statement?

e.g.

table schema:

Id, Name, CreatedDate(getdate())

when i insert into table id = 1 , name = 'john' it will set createdDate = current date

if i run an update statement

update table set name="john2" where id =1

Will it update the createdDate?

Answer 1

wow – hard to understand…

i think NO based on the clues.

if you insert a record with a NULL in a column, and that column has a default value defined, then the default value will be stored instead of null.

update will only update the columns specified in the statement.

UNLESS you have a trigger that does the special logic – in which case, you need to look at the trigger code to know the answer.