...句(insert,update,delete),也不能读写远程包的变量 为了对包的公用函数加以限制,在定义包规范时,可以使用纯度级别(purity level)限制公用函数 语法:pragmarestrict_references (function_name,wnds[,wnps][,rnds][,rnps]); wnds:用于限制函数不能修改数据库数...
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a lower purity level 纯度低
For example, in order to maintain the highest level of genetic purity, distinct varieties of self-pollinated crops such as wheat, rice, soybeans and barley need to be separated by at least 60 feet.
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