CATEGORII DOCUMENTE |
CREAREA INDECSILOR
Indexarea tabelei
Sintaxa comenzii INDEX
INDEX ON eExpression TO IDXFileName | TAG TagName [OF CDXFileName] [FOR lExpression] [COMPACT] [ASCENDING | DESCENDING] [UNIQUE | CANDIDATE] [ADDITIVE] |
expresia de indexare - cheie simpla, cheie compusa
o tip (N, D, L, C)
o omogenizare tip:
STR (<expn1 [,<expn2> [,<expn3>]) →<expC>
DTOS (<expd>) →<expc> (aaaallzz)
Exemplu: SERIA+STR(GRUPA,3)
o mod de ordonare - In functie de tipul expresiei
Oservatie. Indecsi izolati ↑
INDEX ON SERIA TO S.IDX
INDEX ON MEDIA TO MED
INDEX ON SERIA+STR(GRUPA,3) TAG SG
INDEX ON STR(MEDIA,5,2)+NP TAG MEDNP OF STUD.CDX
INDEX ON SERIA+NP TAG SNP OF STUD.CDX
INDEX ON NOTA1 TAG N1 DESCENDING
7. INDEX ON SERIA+STR(GRUPA,3)+NP TAG SGNP OF AN2I
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