在看SG时，有一些看不太懂是什么意思，请大家帮我看看，先谢谢了1 non-pl/sql variables:bind and host variables.non-pl/sql variables include host language variables declared in precomplier programs,screen fields in Forms applications,and iSQL*Plus host variables2 composite data types,such as records,allow groups of fields to be defined and manipulated in pl/sql blocks. groups of fields怎么翻译呢？可以翻译成数组么？3 reference date types hold values,called pointers.hold翻译成什么呢？
2.复合数据类型-composite data types,
3.引用类型-reference date types这个我看懂，能回答一下我的问题么？