By TJ O'Donnell
Read Online or Download Design and Use of Relational Databases in Chemistry - Google Books Result PDF
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Additional info for Design and Use of Relational Databases in Chemistry - Google Books Result
4. Here it would be method 3. The logP table would be altered so that the appropriate rows for compound 1 would use method 2 and method 3. 3. 6. Some authors advocate analyzing schemas of tables up to normal form 3 and then backing off to second normal form in order to increase efficiency. 6 More Complete logP Method Table Id Description 1 2 3 Hansch, C. et al. 3 may not be necessary. The advantage of creating a method id and using a method table gives great flexibility and allows accurate and detailed description of each method.
For compounds with multiple logP values, there would be multiple rows each with a different logP value, but with the same name and molecular weight (and same compound id). Efficiently joining tables requires careful consideration of primary key and foreign key columns, uniqueness, and indexing. While it is not necessary to use a primary key and its related foreign key column when joining tables, that is a very common, useful, and efficient way to join tables. 13 Normal Forms There are many existing rules in SQL that prevent problems that cannot be prevented when using flat files.
A simple SQL command would accomplish this, but would run on the server. Only the resulting subset of data would be delivered to the client. 0. 0, the relative efficiencies and loads of the server and client, and the speed and latency of the data channel linking the server and client. 0, the degree of complexity is an important consideration. Clearly, there is no simple “one size fits all” solution to deciding whether to use a server or client program. The standard way of sharing data between a client and an RDBMS server is to use the SQL language.