Database Systems - First Normal Form
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( ! ) Warning: Undefined array key "vote" in /home/hsntest/includes/class/pres/course.pres on line 311 Call Stack # Time Memory Function Location 1 0.0004 443640 {main}( ) .../resources: 0 2 0.0252 1415696 hsnPage->outputFullPage( ) .../resources: 326 3 0.0254 1440000 include( '/home/hsntest/includes/page/hsn2.1.tpl ) .../hsnPage.class: 518 4 0.0256 1457888 include( '/home/hsntest/includes/body/course/download.php ) .../hsn2.1.tpl: 126 5 0.0257 1458424 presCourse->personal_rating_tosubmit( $object = ['id' => '31010'] , $change_sep = '' ) .../download.php: 19
( ! ) Warning: Undefined array key "vote" in /home/hsntest/includes/class/pres/course.pres on line 315 Call Stack # Time Memory Function Location 1 0.0004 443640 {main}( ) .../resources: 0 2 0.0252 1415696 hsnPage->outputFullPage( ) .../resources: 326 3 0.0254 1440000 include( '/home/hsntest/includes/page/hsn2.1.tpl ) .../hsnPage.class: 518 4 0.0256 1457888 include( '/home/hsntest/includes/body/course/download.php ) .../hsn2.1.tpl: 126 5 0.0257 1458424 presCourse->personal_rating_tosubmit( $object = ['id' => '31010'] , $change_sep = '' ) .../download.php: 19
( ! ) Warning: Undefined variable $html in /home/hsntest/includes/class/pres/course.pres on line 319 Call Stack # Time Memory Function Location 1 0.0004 443640 {main}( ) .../resources: 0 2 0.0252 1415696 hsnPage->outputFullPage( ) .../resources: 326 3 0.0254 1440000 include( '/home/hsntest/includes/page/hsn2.1.tpl ) .../hsnPage.class: 518 4 0.0256 1457888 include( '/home/hsntest/includes/body/course/download.php ) .../hsn2.1.tpl: 126 5 0.0257 1458424 presCourse->personal_rating_tosubmit( $object = ['id' => '31010'] , $change_sep = '' ) .../download.php: 19
( ! ) Warning: Undefined variable $html in /home/hsntest/includes/class/pres/course.pres on line 436 Call Stack # Time Memory Function Location 1 0.0004 443640 {main}( ) .../resources: 0 2 0.0252 1415696 hsnPage->outputFullPage( ) .../resources: 326 3 0.0254 1440000 include( '/home/hsntest/includes/page/hsn2.1.tpl ) .../hsnPage.class: 518 4 0.0256 1457888 include( '/home/hsntest/includes/body/course/download.php ) .../hsn2.1.tpl: 126 5 0.0257 1458424 presCourse->personal_rating_tosubmit( $object = ['id' => '31010'] , $change_sep = '' ) .../download.php: 19 6 0.0260 1458520 presCourse->unrated_stars( $item_id = '31010' , $tosubmit = TRUE , $foradd = ??? ) .../course.pres: 324
( ! ) Warning: Undefined array key "vote" in /home/hsntest/includes/class/pres/course.pres on line 334 Call Stack # Time Memory Function Location 1 0.0004 443640 {main}( ) .../resources: 0 2 0.0252 1415696 hsnPage->outputFullPage( ) .../resources: 326 3 0.0254 1440000 include( '/home/hsntest/includes/page/hsn2.1.tpl ) .../hsnPage.class: 518 4 0.0256 1457888 include( '/home/hsntest/includes/body/course/download.php ) .../hsn2.1.tpl: 126 5 0.0257 1458424 presCourse->personal_rating_tosubmit( $object = ['id' => '31010'] , $change_sep = '' ) .../download.php: 19
( ! ) Warning: Undefined variable $html in /home/hsntest/includes/class/pres/course.pres on line 418 Call Stack # Time Memory Function Location 1 0.0004 443640 {main}( ) .../resources: 0 2 0.0252 1415696 hsnPage->outputFullPage( ) .../resources: 326 3 0.0254 1440000 include( '/home/hsntest/includes/page/hsn2.1.tpl ) .../hsnPage.class: 518 4 0.0256 1457888 include( '/home/hsntest/includes/body/course/download.php ) .../hsn2.1.tpl: 126 5 0.0257 1458424 presCourse->personal_rating_tosubmit( $object = ['id' => '31010'] , $change_sep = '' ) .../download.php: 19 6 0.0262 1459960 presCourse->rated_stars( $item_id = '31010' , $number = NULL ) .../course.pres: 334
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Details
Takes a simple example through to 1NF to illustrate the process. Also stresses why normalising is important.
These notes are intended for use with Important Concepts .
Credit
Higher Still Notes
Disclaimer
While every effort is made to ensure that the content of this release is accurate, Higher Still Notes
does not accept liability for any problems which may arise from inaccuracies in this release.
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( ! ) Warning: Undefined array key "feedback_submitted" in /home/hsntest/includes/body/course/download.php on line 59 Call Stack # Time Memory Function Location 1 0.0004 443640 {main}( ) .../resources: 0 2 0.0252 1415696 hsnPage->outputFullPage( ) .../resources: 326 3 0.0254 1440000 include( '/home/hsntest/includes/page/hsn2.1.tpl ) .../hsnPage.class: 518 4 0.0256 1457888 include( '/home/hsntest/includes/body/course/download.php ) .../hsn2.1.tpl: 126
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