The relational model is the basis for most modern databases, while SQL is the most commonly used query language. However, there are data structures and computational problems that cannot be expressed using SQL-92 queries. Among them are those concerned with the bill-of-material and corporate hierarchies. A newer standard, called the SQL-99, introduced recursive queries which can be used to solv...

exposure to traumatic events is common in children and adolescent. post traumatic stress disorder (ptsd) is an emotional reaction to traumatic events, which is increasingly recognized to be a prevalent and disabling disorder. the aim of this study is to determine the distribution of normative life events which predicts ptsd in youth who referred to an outpatient clinic in rasht, iran. this stud...

in order to determine the responses of morphological characteristics, yield and yield components of rapeseed (brassica napus l.) to plant density and weed interference duration, a factorial experiment was conducted using a randomized complete block design with 3 replications at the rice research institute of iran (rrii) in rasht, in the 2008 growing season. the factors comprised plant density a...

abstract since about 34% of areas under rice cultivation in whole country is attributed to gilan; in this study we pay attention to some economical dimensions, especially economic values of inputs in this region. data were collected from 80 rice producers in 2007-2008. consider to importance the parametric approach in production structure and factors demand, applying seemingly unrelated regress...

introduction: few studies on benign soft tissue tumors of oral cavity have been conducted in an iranian population. the purpose of this study was to evaluate the prevalence of the benign soft tissue tumors of the oral cavity in three central pathology centers of rasht, iran. materials and methods: in this retrospective study, all benign soft tissue tumors of the oral cavity, were retrieved from...