By TJ O'Donnell
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Extra info for Design and Use of Relational Databases in Chemistry - Google Books Result
This is almost never intended, but can be useful when necessary. The following SQL command will delete one row from the structure table. structure where id=1002; Again, it is important to use a Where clause in the delete statement to specify precisely which rows are to be deleted and to prevent accidental deletion. There are many other SQL commands besides Create, Insert, Update, Delete, and Select. For example, the Alter command modifies tables, columns, schemas, and other aspects of the database.
It has rows and columns of defined data types just as a table. A view is defined by selecting particular rows and columns from one or more tables, using an SQL select statement. For example: Create View test_set (logp, temp) As Select logp, temp From literature_data Where ref Like 'Hansch%1995%' And temp Is Not Null; Chapter 3: Structured Query Language (SQL) 29 creates a view called test _ set, which is a subset of the table named literature _ data. The test_set will only contain rows with octanolwater partition coefficients reported by Hansch in 1985 and having a temperature reported.
The flexibility of this approach makes it easy to start simply and expand portions of the system as required. 1 shows a sample Web page from phpPgAdmin. The left frame is interactive, allowing the user to view and select various database, schemas, tables, functions, etc. The right frame typically shows table data, results of SQL commands, or interactive Web forms allowing operations on the database. 2 shows a typical RDBMS installation. The server is a Linux server using PostgreSQL, Oracle, or MySQL as the RDBMS, apache as the Web server, php as a Web application language, and psql, plsql or mysql as an SQL command shell.