Inserting records in specific columns
Let’s say we just have information about the
grade of a new student, and that’s the only information we want to add in a new record to the table.
One way of doing this is adding
NULL for all the columns for which data is not available.
However, there is a cleaner way of doing it. Look at the statement below:
This extended syntax of
INSERT INTO can be used to push data only for specific columns as a new row of records. The table name (in this case,
students) is followed by a list of names of specific columns in parentheses. Then, we can include values for only those items in the
Needless to say, the count, order and type of values in the specific columns list should match the same for the values being inserted.
The same concept can be used for inserting multiple rows of data for specific columns as well.
However, please note that inserting data in specific columns is
not always going to work. If columns others than the ones mentioned in the specific columns list have a few
CONSTRAINTS on them, that need information on them to be present, these statements will throw errors. We will cover that in detail in the next chapters.