By Lex deHaan, Karen Morton, Tim Gorman, Inger Jorgensen, Daniel Fink
Starting Oracle SQL is your creation to the interactive question instruments and particular dialect of SQL used with Oracle Database. The publication is a revision of the vintage getting to know Oracle SQL and SQL*Plus through Lex de Haan, and has been up-to-date to hide advancements in Oracle's model of the SQL question language. Written in an easygoing and example-based variety, starting Oracle SQL is the publication that would get you begun down the trail to effectively writing SQL statements and getting effects from Oracle database.
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These expressions evaluate to TRUE or FALSE. Sometimes, the outcome is UNKNOWN, such as when you have rows with missing information. We will revisit this topic in more detail in Chapter 4, when we discuss null values. Logical Operators SQL also offers three operators whose operands are conditions: the logical (or Boolean) operators. Table 2-7 lists these operators.
In this table, simplicity rules. This way, every salary always falls into exactly one grade. Moreover, the actual monetary unit (currency) for salaries, commission, and bonuses is left undefined. The optional tax-free bonus is paid monthly, just like the regular monthly salaries. In the COURSES table, three CATEGORY values are allowed: x GEN (general), for introductory courses x BLD (build), for building applications x DSG (design), for system analysis and design This means that these three values are the only values allowed for the CATEGORY column; this is an example of an attribute constraint.
Note You can download a script to create the case tables used in this book. com/book/view/1430271970. Then look in the “Book Resources” section on that page. You should see a download containing a script to create and populate the example schema for the book. The ERM Diagram of the Case We start with an ERM diagram depicting the logical design of our case, which means that it does not consider any physical (implementation-dependent) circumstances. A physical design is the next stage, when the choice is made to implement the case in an RDBMS environment, typically resulting in a table diagram or just a text file with the SQL statements to create the tables and their constraints.