ǡ١ǽפindexǤ뤬ƤfieldindexΤϡ¿ξ̵̤Ǥ롣

Ƥ⡢줬Ѥʤа̣ʤ

index뤳ȤϡfieldΥԡ뤳Ȥ˶᤯ǽ㲼򾷤

ƤfieldindexɲäСơ֥뤬2ĤΤƱ

ȯȡξ˽񤭹ޤͤФʤʤ(Ʊ)

indexΩĤʬʤΤˡƤfieldФindexꤹΤ̵̡

ɼ褬ᥤξϡʤϥޥ...

indexꤷƤȤʤfieldϡۤɹͤʤƤʬϤ

褯Τ祭ˤϴindexΤˡȤ̤indexƤѥ

Ĺ̵̤Ǥ롣

ʤSQLˤäƤϡindexΩʤ(Ȥʤ)⤢롣

̾ϡĢõ롣

Ģˤϡν¤Ǥ뤫

̾ξϡ줬Ȥʤ

ƤФơ̾Ǥǽ뤫

ʣindex(sei),̾(mei)νꤷƤ⡢̾ǤSELECTˤΩʤ

Ʊͤˡ̾ˤORDER BYˤΩʤ

SELECT * FROM `user` ORDER BY `mei`,`sei` ;

ޤLIKE'%'%줿()⡢Ƥ˰פǽΤindexΩʤ

'%%'ȶְפƱ͡

黻ƤӤʤɤ⡢indexΩʤ

WHERE `price` * 1.08 > 1000 ;

Τ褦ʾ硣

indexˤǡ`price`Ǥä`price` * 1.08ǤϤʤ

ϡξդ1.08dzä

WHERE `price` > 1000/1.08 ;

ȤȡindexѤǤ褦ˤʤ롣

()䡢IS NULLOR⡢indexѤǤʤ

âORINǽ񤭴ȡindexѤǤ褦ˤʤ롣

EXPLAINǡꤷindexpossible_keys˴ޤޤƤꡢkeyǼºݤѤƤ뤫ǧƤ

ãͤ˳ؤDB߷ Ű Ԥǽꤿʤʤ
ãͤ˳ؤDB߷ Ű Ԥǽꤿʤʤ
posted with amazlet at 14.06.29
ߥå
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ʲSQLѥϤᡣ

Ʋ⤷Ƥ롣

줳졢뤢롪ߤʣ

ʤưƤ뤫顢ȤSQLν򤷤Ƥȡ쥳ɤȽŤʤäꤷʤ

ȤΤȤͤƤʤΤ͡

ޤͽ̤ۤSELECTƤ뤫OKȽǤꤷƤʤ

͡ʥ쥳ɤƤ硢ͽʤ̤֤Ƥʤ

SQLѥ
SQLѥ
posted with amazlet at 14.06.29
Bill Karwin
饤꡼ѥ
夲󥭥: 7,908


SQLǷѴְռˡפƤޤ졩indexѤƤʤȤ
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