a*a
2 楼
google
【在 d*********t 的大作中提到】
: thanks
【在 d*********t 的大作中提到】
: thanks
n*n
3 楼
(1) the order of rows and columns are not important
(2) Rows contain data about an entity
(3) Columns contain data about attributes of the entity
(4) Cells of the table hold a single value (multi-value is not allowed)
(5) All entries in a column are of the same kind
(6) Each column has a unique name
(7)No two rows may be identical
【在 a*****a 的大作中提到】
: google
(2) Rows contain data about an entity
(3) Columns contain data about attributes of the entity
(4) Cells of the table hold a single value (multi-value is not allowed)
(5) All entries in a column are of the same kind
(6) Each column has a unique name
(7)No two rows may be identical
【在 a*****a 的大作中提到】
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