SQL Server如何将行数转换为列值？

Question

我从表中返回三行，如下所示：

select ID 
from service

结果：

ID 
--
1 
2
3

如何返回如下输出：

count  |    IDs 
-------+----------
3      |    1,2,3

Answer 1

希望这会有所帮助

addNote() {
    const {state} = this.props.navigation;
    axios.post('https://ngc-todo.herokuapp.com/api/tasks', {
        userId: state.params.user,
        status: this.state.done,
        task: this.state.toDoInput,
        dueDate: this.state.dueDate,
        category:this.state.selectCate
    }).then(function(response) {
        console.log(response)
        return response.data; 
        if (response.data.success == true) {
            () =>  this.state.toDoList.push({
                    taskId:response.data.data._id,
                    note: this.state.toDoInput,
                    date: this.state.dueDate, 
                    status: this.state.done,
                    category: this.state.selectCate               
                });
            console.log(this.state.toDoList)
            this.setState({ toDoList: this.state.toDoList });
         } else {
               Alert.alert(response.data.message)
         }
    });
}

Answer 2

如果您打算使用subquery功能，那么您无需select count(1) count, stuff( (select ','+cast(id as varchar) from table for xml path('')), 1,1,'') Ids from table 来计算ID数

npm install source-map@latest --save