ΥڡϤƤʥ֥åޡɲΥڡޤϤƤʥ֥åޡ Υڡlivedoor åפɲΥڡޤlivedoor å

ܼ

ץ

  • ץƥޥ
  • ץʤϡʸϤSQL򤳤νǤ˲ᤷơԥ塼μ¹Լ뤳ȤǤ롣
  • ץʤǤϿʾѤʤ顢绨Ĥ˺Ŭʥץ֤ʤʤʤСDBƥӤˤäƤɤΥץ󤬸Ψ褤ɤѤäƤ뤫Ǥ롣
    • ǡϥΤ褦ˡ̤Υǡ㤦SQLǸϤäŬʥץ򤹤ˤϤʤǤ롣
    • ȥ󥶥Τ褦ˡƱ褦ʥǡФƱ褦SQL٤ˤϻˤäŬʥץ򤹤롣

SQLץѴ

  • UPADTEʸDELETEʸʤɤϡPʬνSELECTʸƱǤ롣
  • INSERTʸϿʥץɲýʤΤǽϤñˤʤ롣

SELECTʸξ

  • ǼѴˡ⹩׼ǤϸΨΤ褤ץ󤬤Ǥ롣

1FROMΥơ֥ꥹȤˤ뤹٤ƤΥơ֥ľ

ơ֥˥ӥ塼ϡӥ塼ƤSELECTʸη̤ȤľѤ롣

2WHERE礬Ȥˤϡξ˹פΤ򥹥ƥå1η̤ӽФ

3GROUP BY礬Ȥϡƥå2η̤°ꥹȤͤ٤ƱΤ򥰥롼פʬ롣θϡΥ롼פȤ˽롣

4SELECT°ꥹȤΤ׻ɬפʤΤϷ׻Ԥ

°ꥹȤˤCOUNT,MAX,SUM,AVERAGEʤɤʣΥפ׻Τ⤢ʽؿˡؿη׻ϡƥå3GROUP Byʬ롼פȤ˹Ԥ

ǤϤʤΤϡץ뤴Ȥ˷׻롣

5HAVING礬ϡƥå4η̤Τ˹礦ΤΤߤФ

6SELECT°ꥹȤ˻ꤵ줿ΤΤߤ̤ȤƼФHAVINGǤϡSELECT°ꥹȤˤʤ°ȤȤǤΤǡSELECT°ꥹȤμФϺǸˤʤ롣

ץβ

  • ץβˤϡĤδطε§ȤȤˤʤ롣
    • ֽפʤΤϡľѤؤѴǤ롣
      • 礹뤳ȤǡѤΥץο˸餹ȤǤ롣

ʸ

  • RDBMS˶ء