Optimiser query oyo pona rappel maximale:
Motuna ya SQL oyo epesami eponaka makonzí nyonso na tableau esika motuya ya makonzí1 ekokani na "motuya1". Pona ko optimiser requête pona rappel maximale, tala ba suggestions oyo : 1. Salelá ba conditions OR : Soki ezali na ba valeurs ebele oyo ekoki ko correspondre na ba critères ya recherche, okoki kosalela ba conditions OR pona ko agrandiser portée ya recherche. Ndakisa: ``` SELECT * FROM tableau WHERE colonne1 = "valeur1" OR colonne1 = "valeur2" ``` 2. Salelá opérateur LIKE na ba cartes commotrices: Opérateur LIKE epesi yo nzela ya kosala boyokani ya modèle na ba cartes commotrices. Kosalela elembo ya pourcentage (%) okoki kokokanisa motango nyonso ya bilembo, bakisa mpe zéro. Ndakisa: ``` SELECT * FROM table WHERE colonne1 LIKE "%value1%" ``` Yango ekozongisa ba lignes nionso esika colonne1 ezali na sous-chaîne "value1" esika nionso na kati ya molongo. 3. Kosalela boluki ya makomi mobimba: Soki ozali kosala na ensemble ya ba données ya makomi ya monene, kosalela boluki ya makomi mobimba ekoki kobongisa bokundoli. Ndakisa: ``` SELECT * FROM tableau WHERE MATCH(column1) AGAINST('value1') ``` Etinda oyo esalelamaka pona koluka "value1" na kati ya esika ya colonne1, pe kozongisa ba lignes nionso oyo ezali na yango. 4. Kosalela UNION : Okoki kosalela opérateur UNION pona kosangisa ba résultats ya ba déclarations SELECT mibale to koleka. Ndakisa: ``` SELECT * FROM tableau WHERE colonne1 = "valeur1" UNION SELECT * FROM tableau WHERE colonne2 = "valeur2" ``` Yango ekozongisa ba lignes nionso esika colonne1 ezali "valeur1" to colonne2 ezali "valeur2". Opérateur ya UNION asangisaka ba résultats mpe elongolaka ba doublons. Makanisi oyo nyonso ekoki kosalisa mpo na kobongisa bokundoli na koyeisa monene bonene ya boluki mpe kozongisa milɔngɔ mingi oyo ekokani na makambo ya boluki.