ื ื™ื”ื•ืœ ืฉืจืช SQL: ืคื™ืชื•ื—, ืื‘ื˜ื—ื”, ื™ืฆื™ืจืช ืžืกื“ ื ืชื•ื ื™ื

ืฉืจืช SQL โ€“ ืžื•ืฆืจ ื™ื™ื—ื•ื“ื™ ืฉื™ื›ื•ืœ ืœืขื‘ื•ื“ ืขื ืžืกืคืจ ืขืฆื•ื ืฉืœ ืžืื’ืจื™ ืžื™ื“ืข ื•ืžื‘ืฆืข ืคื•ื ืงืฆื™ื•ืช ืชื›ื ื•ืช ื•ื ื™ื”ื•ืœ.

ื ื™ื”ื•ืœ ืฉืจืช sql ื›ืจื•ืš ื‘ืคื™ืชื•ื— ืžืขืจื›ืช ื‘ืกื™ืก ืžื™ื“ืข, ื™ืฆื™ืจืช ืžืขืจื›ืช ืื‘ื˜ื—ื”, ื”ื™ื“ื•ืจ ืฉืœ ืžืกื“ ื ืชื•ื ื™ื, ืื•ื‘ื™ื™ืงื˜ื™ื, ื•ืžืืคืฉืจ ืœืžืฉืชืžืฉื™ื ืœื’ืฉืช ืœืžื™ื“ืข ื”ื–ืžื™ืŸ ื‘ืžืกื“ ื”ื ืชื•ื ื™ื.
ื”ืžื ื”ืœ ื™ื•ืฆืจ ืžืขืช ืœืขืช ืขื•ืชืงื™ ื’ื™ื‘ื•ื™, ื‘ื•ื“ืง ืืช ืชืงื™ื ื•ืช ืžืขืจื›ืช ื”ืžื™ื“ืข ื•ืฉื•ืœื˜ ื‘ื ืคื— ื”ืžื•ืชืจ ืฉืœ ืงื‘ืฆื™ ืžื™ื“ืข ื•ื™ื•ืžื ื™ ืขืกืงืื•ืช.

DB ื”ื•ื ืงื‘ื•ืฆื” ื‘ืขืœืช ืฉื ืฉืœ ืจื›ื™ื‘ื™ื ื”ืงืฉื•ืจื™ื ื–ื” ื‘ื–ื”

ืžืกื“ ื ืชื•ื ื™ื ื–ื” ืžื ื•ื”ืœ ืขืœ ื™ื“ื™ ืžืขืจื›ืช ืžื™ื•ื—ื“ืช, ืฉื”ื™ื ืžื›ืœื•ืœ ืฉืœ ื›ืœื™ ืฉืคื” ื•ืชื•ื›ื ื” ื”ืฉื•ืžืจื™ื ืขืœ ื”ืจืœื•ื•ื ื˜ื™ื•ืช ืฉืœื• ื•ืžืืจื’ื ื™ื ื—ื™ืคื•ืฉ ืžื”ื™ืจ ืื—ืจ ื”ืžื™ื“ืข ื”ื“ืจื•ืฉ.
ืžื‘ื ื” ืžืกื“ ื ืชื•ื ื™ื
ื›ื“ื™ ืœืืจื’ืŸ ื‘ืกื™ืก ืžื™ื“ืข ืื™ื›ื•ืชื™, ืขืœ ื”ืžื ื”ืœ ืœื’ืฉืช ืืœื™ื• ื‘ืื—ืจื™ื•ืช, ืœืœืžื•ื“ ื”ื™ื˜ื‘ ืืช ืืคืฉืจื•ื™ื•ืช ื”ืฉื™ืžื•ืฉ ื”ืจื‘ื•ืช ื‘ืžื™ื“ืข ื”ื–ืžื™ืŸ, ืœื“ืื•ื’ ืœืฉื™ืœื•ื‘ ืืคืฉืจื™ ืขื ืžืขืจื›ื•ืช ืื—ืจื•ืช ื•ื’ื™ืฉื”, ื•ื›ืŸ, ื‘ืืžืฆืขื•ืช ื˜ื›ื ื•ืœื•ื’ื™ื•ืช ื—ื“ื™ืฉื•ืช, ืœื‘ืฆืข ืืช ื”ืฉื™ื ื•ื™ื™ื ื”ื ื“ืจืฉื™ื ื”ืžืขืจื›ืช.

ื ื™ื”ื•ืœ ืฉืจืช SQL ืžืชื‘ืฆืข ื‘ืฉืชื™ ื’ืจืกืื•ืช

ื”ืจืืฉื•ืŸ ื”ื•ื ืฉืจืช ืงื‘ืฆื™ื, ืฉื‘ื• ืžืกื“ ื”ื ืชื•ื ื™ื ืžืžื•ืงื ืขืœ ืฉืจืช ืงื‘ืฆื™ื, ื”ื•ื ืžืกืคืง ืื—ืกื•ืŸ ืฉืœ ื‘ืกื™ืก ื”ืžื™ื“ืข ื•ื’ื™ืฉื” ืืœื™ื• ืขืœ ื™ื“ื™ ืœืงื•ื—ื•ืช ื”ืคื•ืขืœื™ื ืขืœ ืžื—ืฉื‘ื™ื ืฉื•ื ื™ื. ื”ืขื™ื‘ื•ื“ ืžืชื‘ืฆืข ื‘ืชื—ื ื•ืช ืขื‘ื•ื“ื” ื‘ื”ืŸ ืžื•ืขื‘ืจื™ื ืงื‘ืฆื™ ืžืกื“ ื ืชื•ื ื™ื. ืœืžื—ืฉื‘ื™ื ื”ืื™ืฉื™ื™ื ืฉืœ ื”ืœืงื•ื—ื•ืช ื™ืฉ ืžืขืจื›ืช ื‘ืงืจื” ื”ืžืขื‘ื“ืช ืืช ื”ืžื™ื“ืข ื”ืžื•ืขื‘ืจ.
ื’ืจืกืช ื”ืœืงื•ื—-ืฉืจืช, ื‘ื ื•ืกืฃ ืœืื‘ื˜ื—ื”, ืžืขื‘ื“ืช ืืช ื›ืœ ื ืคื— ื”ื ืชื•ื ื™ื. ื‘ืงืฉื” ื”ื ืฉืœื—ืช ืœื‘ื™ืฆื•ืข, ืฉื”ื•ืฆืื” ืขืœ ื™ื“ื™ ื”ืœืงื•ื—, ืžืขื•ืจืจืช ื—ื™ืคื•ืฉ ื•ืฉืœื™ืคื” ืฉืœ ื”ืžื™ื“ืข ื”ื“ืจื•ืฉ. ืžื™ื“ืข ื–ื” ืžื•ืขื‘ืจ ื“ืจืš ื”ืจืฉืช ืžื”ืฉืจืช ืœืœืงื•ื—.
ืฉืจืช ื”ืœืงื•ื— ืžื•ืจื›ื‘ ืžืฉื ื™ ื—ืœืงื™ื: ืœืงื•ื— ื•ืฉืจืช.
ื”ืœืงื•ื— ืžืžื•ืงื ืขืœ ืžื—ืฉื‘ ืื™ืฉื™; ื”ื•ื ืžื‘ืฆืข ืืช ื”ืคื•ื ืงืฆื™ื•ืช ืฉืœ ืืกืคืงืช ืžืžืฉืง ื’ืจืคื™.
ื—ืœืง ื”ืฉืจืช ืžืžื•ืงื ื‘ ืฉืจืช ื™ื™ืขื•ื“ื™ ื•ืชื•ืจื ืœืืกืคืงืช ืฉื™ืชื•ืฃ ืžื™ื“ืข, ื ื™ื”ื•ืœ ื‘ืกื™ืกื™ ืžื™ื“ืข, ืฉื™ืจื•ืชื™ ืื“ืžื™ื ื™ืกื˜ืจืฆื™ื” ื•ืืžืฆืขื™ ืื‘ื˜ื—ื”.
ืžืขืจื›ืช ืฉืจืช-ืœืงื•ื— ืžืื•ืคื™ื™ื ืช ื‘ืฉื™ืžื•ืฉ ื‘ื˜ื›ื ื™ืงืช ืฉืคื” ืžื™ื•ื—ื“ืช ื”ืžื‘ื ื” ืฉืื™ืœืชื•ืช ื•ื’ื ืžืกืคืงืช ื›ืœื™ื ื™ืขื™ืœื™ื ืœื’ื™ืฉื” ืœืžืกื“ ื”ื ืชื•ื ื™ื.

 

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