给数据库查询结果添加一个额外的自增编号

1、在mysql数据库可以执行的sql

SELECT
	( @i := @i + 1 ) num,
	M.* 
FROM
	user M,
	( SELECT @i := 0 ) AS ID 
GROUP BY
	M.ID 
ORDER BY
	M.create_time

SELECT (@i :=@i + 1)  是为了生成自增的序列号字段

SELECT @i := 0 是为了将i进行初始化每次查询的序列号都会从1开始进行排序生成序列号

 在mysql中执行的结果：

2、在postgresql数据库可以执行的sql

SELECT 
	ROW_NUMBER() OVER (ORDER BY create_time) AS two_num,
	id AS two_id,
	factory_area AS two_factory_area,
	enter_date AS two_enter_date,
	classes AS two_classes,
	teams AS two_teams,
	enter_car_no AS two_enter_car_no,
	enter_time AS two_enter_time,
	stop_time AS two_stop_time,
	mineral_num AS two_mineral_num,
	unit AS two_unit,
	blocked_up AS two_blocked_up,
	loading AS two_loading,
	remark AS two_remark
FROM
	dispatch_enter_soil_record
WHERE
	del_flag = '0'
    and factory_area = 'qt_two'
    and enter_date = '2023-11-17'
	and classes = '1'
    and teams = '4'
order by create_time

在postgresql中执行的结果：

row_number() 函数

row_number() 函数返回当前行所在的分区内的序号，从 1 开始。

 语法

row_number()
OVER (
  [PARTITION BY partition_column_list]
  [ORDER BY order_column_list]
)

partition_column_list 参与分区的列的列表。

order_column_list 参与排序的列的列表。