Difference between require() and include() is that require() produces a FATAL ERROR if the file you want to include is not found, while include() only produces a WARNING.There is also include_once() which is the same as include(), but the difference between them is the same as the d...
Know Difference between Oracle Reserved Words and Keywords 与C和JAVA体系类似,Oracle中存在一些保留词(Reserved Words)或关键词(Keywords)以及少量的命名空间(Namespace)。 保留词(Reserved Words)是优先级最高的词汇,在Oracle中这些词都有着特殊的意义。所以这些词不允许被重定义 (redefine),换而言之就不是不允许...
如上表所列START为一个保留词 SQL> CREATE TABLE START (T1 INT); CREATE TABLE START (T1 INT) ORA-00903: invalid table name 利用双引号可以成功将保留词用作对象名,但是在管理时会很麻烦,极力不推荐! SQL> CREATE TABLE "START" (T1 INT); Table created SQL> SELECT * FROM START; SELECT * FROM...