[FLINK-23243][docs-zh]Translate "SELECT & WHERE clause" page into Chinese

docs/content.zh/docs/dev/table/sql/queries/select.md

@@ -1,5 +1,5 @@
 ---
-title: "SELECT & WHERE"
+title: "SELECT 与 WHERE"
 weight: 4
 type: docs
 ---
@@ -22,44 +22,45 @@ specific language governing permissions and limitations
 under the License.
 -->
 
-# SELECT & WHERE clause
+# SELECT 与 WHERE 子句
 
 {{< label Batch >}} {{< label Streaming >}}
 
-The general syntax of the `SELECT` statement is:
+`SELECT` 语句的常见语法格式如下所示:
 
 ```sql
 SELECT select_list FROM table_expression [ WHERE boolean_expression ]
 ```
 
-The `table_expression` refers to any source of data. It could be an existing table, view, or `VALUES` clause, the joined results of multiple existing tables, or a subquery. Assuming that the table is available in the catalog, the following would read all rows from `Orders`.
+这里的 `table_expression` 可以是任意的数据来源。它可以是一张已经存在的表、视图或者 `VALUES` 子句，也可以是多个现有表的关联结果、或一个子查询。这里我们假设 `Orders` 表在 `Catalog` 中处于可用状态，那么下面的语句会从 `Orders` 表中读出所有的行。
 
 ```sql
 SELECT * FROM Orders
 ```
 
-The `select_list` specification `*` means the query will resolve all columns. However, usage of `*` is discouraged in production because it makes queries less robust to catalog changes. Instead, a `select_list` can specify a subset of available columns or make calculations using said columns. For example, if `Orders` has columns named `order_id`, `price`, and `tax` you could write the following query:
+在 `select_list` 处的 `*` 表示查询操作将会解析所有列。但是，我们不鼓励在生产中使用 `*` ， 因为它会使查询操作在应对 `Catalog` 变化的时候鲁棒性降低。相反，我们可以在 `select_list` 处指定它为可用列的子集，或者使用声明过的列进行计算。例如，这里我们假设在 `Orders` 表中有名为 `order_id`、 `price`、 和 `tax` 的列，那么可以有以下查询语句：
 
 ```sql
 SELECT order_id, price + tax FROM Orders
 ```
 
-Queries can also consume from inline data using the `VALUES` clause. Each tuple corresponds to one row and an alias may be provided to assign names to each column.
+查询操作还可以在 `VALUES` 子句中使用内联数据。每一个元组对应一行，另外可以通过设置别名来为每一列指定名称。
 
 ```sql
 SELECT order_id, price FROM (VALUES (1, 2.0), (2, 3.1))  AS t (order_id, price)
 ```
 
-Rows can be filtered based on a `WHERE` clause.
+可以根据 `WHERE` 子句对行数据进行过滤。
 
 ```sql
 SELECT price + tax FROM Orders WHERE id = 10
 ```
 
-Additionally, built-in and [user-defined scalar functions]({{< ref "docs/dev/table/functions/udfs" >}}) can be invoked on the columns of a single row. User-defined functions must be registered in a catalog before use.
+此外，在任意一行的列上你可以调用内置函数和 [ 用户自定义标量函数 （ user-defined scalar functions ）]({{< ref "docs/dev/table/functions/udfs" >}}) 。当然，在使用前用户自定义函数（ user-defined functions ）必须已经注册到 `Catalog` 中。
 
 ```sql
 SELECT PRETTY_PRINT(order_id) FROM Orders
 ```
 
 {{< top >}}
+