1、在mysql数据库可以执行的sql

SELECT( @i := @i + 1 ) num,M.* 
FROMuser M,( SELECT @i := 0 ) AS ID 
GROUP BYM.ID 
ORDER BYM.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
FROMdispatch_enter_soil_record
WHEREdel_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。