求翻译：UNION 运算符通过组合其他两个结果表（例如 TABLE1 和 TABLE2）并消去表中任何重复行而派生出一个结果表。当 ALL 随 UNION 一起使用时（即 UNION ALL），不消除重复行。两种情况下，派生表的每一行不是来自 TABLE1 就是来自 TABLE2。是什么意思？

The union operator through a combination of the results of the other two tables (for example, table1 and table2) and elimination in the table of any duplicate rows derived from a result table. All with the union when used in conjunction (ie, the union all), does not eliminate duplicate rows. In both

Portfolio UNION unary operator through two other results table (for example TABLE TABLE 1 and 2) and it has removed any duplication in the table are derived from a results table. When ALL UNION when used together with UNION ALL (i.e. , not eliminate duplication. Two circumstances, derived from table

The UNION operator through combines other two result table (e.g. TABLE1 and TABLE2) and eliminates in the table any repetition line to derive a result table.When ALL uses together along with UNION (i.e. UNION ALL), does not eliminate the redundant line.In two kind of situations, derivation table eac

UNION operator through a combination of the other two tables of results (for example, TABLE1 and TABLE2) and any duplicate rows in the deleted table and derive a result table. When ALL when it is used with the UNION (UNION ALL), does not eliminate duplicate rows. In two cases, derived not from TABLE

select count (*) as shuliang = '1 'from the table where stock = 10