• as
    • 语法
    • 参数
    • 示例

    as

    用于为集合名、字段名或结果集指定别名（alias）。

    语法

    <cs_name.cl_name | (select_set) | field_name> as <alias_name>

    参数

    参数名参数类型描述是否必填
    cs_namestring集合空间名。否
    cl_namestring集合名。否
    select_setset查询结果集。否
    field_namestring字段名。否
    alias_namestring别名。是

    示例

    • 集合 foo.bar 中存在如下记录。
    1. { "name": "Lucy", "age": 11 }
    2. { "name": "Sam", "age": 8 }
    3. { "name": "Tom", "age": 7 }
    4. { "name": "James", "age": 12 }
    • 集合别名。
    1. > db.exec("select T1.age, T1.name from foo.bar as T1 where T1.age>10")
    2. { "name": "Lucy", "age": 11 }
    3. { "name": "James", "age": 12 }
    4. Return 2 row(s).
    5. Takes 0.6149s.
    • 字段别名。
    1. > db.exec("select age as 年龄 from foo.bar where age>10")
    2. { "年龄": 11 }
    3. { "年龄": 12 }
    4. Return 2 row(s).
    5. Takes 0.2981s.
    • 结果集别名。
    1. > db.exec("select T.age, T.name from (select age, name from foo.bar) as T where T.age>10")
    2. { "name": "Lucy", "age": 11 }
    3. { "name": "James", "age": 12 }
    4. Return 2 row(s).
    5. Takes 0.3920s.