Column to add or modify the rules

Adding columns to a table of rules

What can home at any time is not specified as NOT NULL columns.

How to increase the NOT NULL column?

Click these steps:

1, increasing the column, but not set to NOT NULL.

2, this column data in each row are added.

3, this series was revised to NOT NULL.

Modify the rules set out:

Character at any time to increase the width of the column

Increase in number at any time, type out the number of bits

Can increase or decrease at any time type of the column number of digits after the decimal point

When the table is empty

Can change the data type

Reduce the column width of character

Small number can type out the median.

Re-create or delete table.







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