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 Essay about Questions on Database Principles and Criteria

Essay about Questions on Database Principles and Criteria

A. В DatabaseВ concepts 1 BasicВ SQLВ Command: SQLВ commandsВ whichВ areВ worthВ knowingВ: В­В TRIM (forВ strippingВ spaces) В­В LEFT (forВ fetchingВ theВ dataВ fromВ leftВ sideВ ofВ string) В­В RIGHT (forВ fetchingВ theВ dataВ fromВ rightВ sideВ ofВ string) В­В REPLACEВ В В (forВ replacementВ inВ string) В­В CONVERTВ В В (forВ convertingВ dataВ fromВ oneВ typeВ toВ another) В­В LEN (forВ fetchingВ lengthВ ofВ string) В­В STUFFВ В В В В В В В В (wayВ toВ insertВ oneВ stringВ intoВ another) В­В DIFFERENCEВ (diffВ betweenВ twoВ stringsВ В­В returnВ 4В representsВ noВ diffВ orВ strongВ similarity) two WhatВ isВ normalizationВ andВ whyВ doВ weВ needВ deВ­normalizationВ?…...

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