SADTool = System analysis and desing Tool. tool help draw DFD and ERD. It also give the standard database(NF1, NF2, NF3, ...) (系统自动生成,下载前可以参看下载内容) 下载文件列表 SADTools/DocToolkit/bin/Debug/DocToolkit.dll SADTools/DocToolkit/bin/Debug/DocToolkit.pdb ...
So, First Normal Form (NF1) wants us to get rid ofrepeating elements. What are those? Again we turn our attention to the first invoice (#125) in Figure A-1. Cells H2, H3, and H4 contain a list of Item ID numbers. This is acolumnwithin our first database row. Similarly, I2-I4...
So, First Normal Form (NF1) wants us to get rid ofrepeating elements. What are those? Again we turn our attention to the first invoice (#125) in Figure A-1. Cells H2, H3, and H4 contain a list of Item ID numbers. This is acolumnwithin our first database row. Similarly, I2-I4...