数据库表有什么作用

网站编辑2023-05-10 12:31:22275

数据库表是存储在计算机硬件上的数据集合,它们用于存储用户的数据和操作权限。数据库表可以用来存储数据,比如表、表字段、字段集合等等。

以下是一个简单的关系型数据库表的示例:

```sql /* * @datetime * @relation -- 存储联系信息 */ col1 = "mydatetime" col2 = "mydatetime1" col3 = "mydatetime2" col4 = "mydatetime3" col5 = "mydatetime4" col6 = "mydatetime5" col7 = "mydatetime6" col8 = "mydatetime7" col9 = "mydatetime8" col10 = "mydatetime9" col11 = "mydatetime10" col12 = "mydatetime11" col13 = "mydatetime12" col14 = "mydatetime13" col15 = "mydatetime14" col16 = "mydatetime15" col17 = "mydatetime16" col18 = "mydatetime17" col19 = "mydatetime18" col20 = "mydatetime19" col21 = "mydatetime20" col22 = "mydatetime21" col23 = "mydatetime22" col24 = "mydatetime23" col25 = "mydatetime24" col26 = "mydatetime25" col27 = "mydatetime26" col28 = "mydatetime27" col29 = "mydatetime28" col30 = "mydatetime29" col31 = "mydatetime30" col32 = "mydatetime31" col33 = "mydatetime32" col34 = "mydatetime33" col35 = "mydatetime34" col36 = "mydatetime35" col37 = "mydatetime36" col38 = "mydatetime37" col39 = "mydatetime38" col40 = "mydatetime39" col41 = "mydatetime40" col42 = "mydatetime41" col43 = "mydatetime42" col44 = "mydatetime43" col45 = "mydatetime44" col46 = "mydatetime45" col47 = "mydatetime46" col48 = "mydatetime47" col49 = "mydatetime48" col50 = "mydatetime49" col51 = "mydatetime50" col52 = "mydatetime51" col53 = "mydatetime52" col54 = "mydatetime53"" col55 = "mydatetime55"

// * * @dateTime * * @relation -- 存储时间联系信息 */ col1 = "myDateTime1" col2 = "