Database Concepts (7th Edition)

For undergraduate database administration scholars or enterprise pros


Here’s functional aid for figuring out, growing, and coping with small databases—from of the world’s best database gurus. Database ideas by David Kroenke and David Auer provides undergraduate database administration scholars and enterprise execs alike an organization knowing of the innovations in the back of the software program, utilizing entry 2013 to demonstrate the thoughts and strategies. 3 tasks run during the textual content, to teach scholars the right way to follow the options to real-life enterprise occasions. The textual content presents flexibility for selecting the software program teachers are looking to use in school; permits scholars to paintings with new, whole databases, together with Wedgewood Pacific company, Heather Sweeney Designs, and Wallingford cars; and comprises insurance for a few of the most up-to-date info on databases available.

Teaching and studying event
This textual content will supply a greater educating and studying experience–for you and your scholars. here is how:

  • Provides an organization realizing of the thoughts in the back of the software
  • Uses entry 2013 to demonstrate the thoughts and methods whereas additionally delivering flexibility to decide on the software program utilized in class
  • Allows scholars to paintings with new, entire databases
  • Includes insurance of a few of the most recent details available

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For instance, to drop the project desk and all its information, you utilize the next SQL assertion: /* *** instance CODE – don't RUN *** */ /* *** SQL-DROP-TABLE-CH03-01 *** */ DROP desk project; The SQL DROP desk assertion doesn't paintings if the desk includes or may well comprise values had to satisfy referential integrity constraints. worker, for instance, comprises ­values of EmployeeNumber wanted by way of the international key constraint ASSIGN_EMP_ FK. for this reason, an try and factor the assertion DROP desk worker fails, and an mistakes message is generated. 180  Part 1  Database basics The SQL modify desk assertion To drop the worker desk, you want to first drop the task desk or a minimum of delete the international key constraint ASSIGN_EMP_FK. this can be one position the place the regulate desk command comes in handy. you utilize the SQL adjust desk assertion so as to add, alter, and drop columns and constraints. for instance, you should use it to drop the ASSIGN_ EMP_FK constraint with the assertion: /* *** instance CODE – don't RUN *** */ /* *** SQL-ALTER-TABLE-CH03-01 *** */ regulate desk project DROP CONSTRAINT ASSIGN_EMP_FK; After both shedding the project desk or the ASSIGN_EMP_FK overseas key constraint, you could then effectively drop the worker desk. BTW Now you recognize why it truly is a bonus to manage constraint names by utilizing the CONSTRAINT syntax. simply because we created the overseas key constraint identify ASSIGN_EMP_FK ourselves, we all know what it's. This makes it effortless to take advantage of once we desire it. The SQL TRUNCATE desk assertion The SQL TRUNCATE desk assertion used to be extra within the SQL:2008 regular, so it's one of many newest additions to SQL. just like the SQL DELETE assertion, it truly is used to take away all information from a desk whereas leaving the desk constitution itself within the database. even if, not like the SQL DELETE assertion, the SQL TRUNCATE desk assertion additionally resets any surrogate basic key values again to the place to begin. The SQL TRUNCATE desk assertion doesn't use an SQL the place clause to specify stipulations for the information deletion—all the knowledge within the desk are consistently got rid of while the TRUNCATE desk assertion is used. the next assertion may be used to take away all of the information within the undertaking desk: /* *** instance CODE – don't RUN *** */ /* *** SQL-ALTER-TABLE-CH03-01 *** */ TRUNCATE desk venture; The TRUNCATE desk assertion can't be used with a desk that's referenced by means of a international key constraint simply because this is able to create overseas key values that experience no corresponding basic key worth. hence, whereas we will use TRUNCATE desk with the venture desk, we won't use it with the dept desk. The cost Constraint we will be able to additionally use the SQL regulate desk assertion so as to add a constraint. for instance, contemplate the undertaking desk, which has the columns StartDate and EndDate. evidently, the StartDate needs to be ahead of the EndDate, yet there's at the moment not anything within the desk definition to implement this. this can be a ideal position to exploit a payment constraint. payment constraints are just like the place clauses in SQL queries.

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