摘要:
mod取余 TRUNC (number)截断 TRUNC(number)函数返回截断为n2位小数的n1。如果n2为 省略,则n1被截断为0位。n2可以为负值以截断(置零),n2为小数点后左边两位(-2)。小数点左边一位截断到十位。 ExamplesThe following examples tru 阅读全文
摘要:
Use subqueries for the following purposes: To define the set of rows to be inserted into the target table of an INSERT or CREATE TABLE statement To de 阅读全文