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IP屬地:臺(tái)灣
?數(shù)據(jù)檢索 數(shù)據(jù)檢索是指從數(shù)據(jù)庫中按照預(yù)定條件查詢數(shù)據(jù),及引用相關(guān)數(shù)據(jù)進(jìn)行計(jì)算而獲取所需信息的過程蚕断。 查詢數(shù)據(jù)是數(shù)據(jù)庫操作中最常用、最重要的...
A.創(chuàng)建數(shù)據(jù)庫 create{database|schema}[if not exists]databasename [[def...