By Cristian Darie;Karli Watson
The Programmer's advisor to SQL presents an in-depth but concise educational at the use of based question Language (SQL). as soon as you may have mastered the basics, the e-book serves as a convenient computer reference on SQL utilization, overlaying the entire significant SQL statements that youll want while programming databases. It additionally comes entire with instance code for 5 significant database structures: SQL Server, Oracle, DB2, MySQL, and entry.
In each one case, the ebook demonstrates how the SQL typical is applied (and and infrequently prolonged) via each one database approach seller.
The ebook additionally comprises whole case reviews that exhibit tips to create and question the underlying database for a completely featured web site, in addition to easy methods to enforce role-based safeguard on your purposes. This ebook is perfect for any programmer, analyst, or database administrator looking for a SQL reference that still demonstrates the right way to use SQL to resolve genuine enterprise problems.
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The search condition can take various forms, all of which can be evaluated to a Boolean value. In this case, you're only interested in rows for which the condition ColumnC = Value evaluates to TRUE; in other words, you're interested in those rows in which ColumnC has a value of Value. If this condition is TRUE, then the row is returned. If it evaluates to FALSE or UNKNOWN (because the presence of a NULL value), then it's ignored. Note that there's no need for a WHERE clause of this type to use a column that's being returned by the query (here only ColumnA and ColumnB are returned for rows).
Everything between these delimiters is ignored, for example: /* This is a comment in SQL Server ••• ••• it can span multiple lines! *I Finally, it's worth noting that older versions of MySQL only support# to mark a line as being a comment. Although more modem implementations of MySQL also support this syntax, they also implement the -- method. Summary This chapter covered the basics that are required to understand SQL. We briefly discussed how SQL works and its evolution as a global standard for database access.
A full representation of a many-to-many relationship Because the many-to-many relationship is implemented as two one-tomany relationships, the foreign key constraint is all you need to enforce it. The junction table is the referencing table, and it references the two tables that form the many-to-many relationship. In the junction table, both columns form the primary key, so each (ProductiD, DepartmentiD) pair is guaranteed to be unique. This makes sense because the junction table associates one product with one departmenta product can either be or not be associated with a particular department.