Databases

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Databases

  1. 1. Databases ICT GCSE
  2. 2. Databases <ul><li>A program that allows you to store large amounts of data in an organised way and allows you to retrieve that data easily </li></ul><ul><li>Databases have many advantages: </li></ul><ul><ul><li>Easier/quicker to enter data </li></ul></ul><ul><ul><li>Easier to keep up to date </li></ul></ul><ul><ul><li>Takes up less space </li></ul></ul><ul><ul><li>Easy to sort/search data </li></ul></ul>
  3. 3. Keywords <ul><li>Field </li></ul><ul><ul><li>Contains a single data item </li></ul></ul><ul><li>Record </li></ul><ul><ul><li>Collection of items/fields </li></ul></ul><ul><li>Query </li></ul><ul><ul><li>A search looking for data which meets certain criteria </li></ul></ul>
  4. 4. Table Record Field ID First Name Second Name Age Student No. Form 001 Jamie Chesterton 15 0225127 10T 002 Sarah Smith 15 0332103 10R 003 Ben Jackson 14 0443504 10V 004 Liz Shaw 15 0943439 10E 005 Peri Brown 15 0340343 10M 006 Barbara Wright 15 0943432 10R
  5. 5. Field Types Field Name Field Type Field Length ID Primary Key 3 First Name Text 15 Second Name Text 15 Age Integer 3 Student No. Text 7 Fees Paid Boolean 1 Amount Number 6
  6. 6. Query Search Criteria <ul><li>Equal to ( = ) </li></ul><ul><li>Less than ( < ) </li></ul><ul><li>Greater than ( > ) </li></ul><ul><li>Less than or equal to ( <= ) </li></ul><ul><li>Greater than or equal to ( >= ) </li></ul>

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