union operator meaning in Chinese
合并操作符
Examples
- For browse cannot appear in select statements that are joined by the union operator
For browse不能出现在由union运算符所联接的select语句中。 - However , it is not appropriate to use the logical union operator to union two database queries , or to use the shift operator to write to a stream
但是，使用逻辑union运算符联合两个数据库查询或使用shift运算符写入流则不合适。 - Additionally , when the select statement includes a union operator , the column names or column aliases must be those specified in the first select list
此外，当select语句包含union运算符时，列名或列的别名必须是在第一选择列表内指定的列名或列的别名。 - To find out all accounts with privileges , you can query each of the system catalog views and combine the results together using the union operator , as shown in
要查明具有特权的所有帐号，可以查询每个系统编目视图并使用union操作符将结果组合在一起，如 - However , if select distinct is specified , or if the statement contains a group by clause , or if the select statement contains a union operator , the sort columns must appear in the select list
但是，如果未指定select distinct ，或者如果select语句包含union运算符，则排序列必须出现在选择列表中。