如何从普适性PSQL表中随机选择一行

Question

在普适性PSQL中(特别是(，使用sql select语句，如何从没有数字ID的表中随机选择一行？

Answer 1

这似乎对我使用PSQL v11.30有效。

create table chartest (f1 char (10), f2 char(10), f3 char(10));
insert into chartest values ('a','a','a');
insert into chartest values ('b','b','b');
insert into chartest values ('c','c','c');
insert into chartest values ('d','d','d');
insert into chartest values ('e','e','e');
insert into chartest values ('f','f','f');
select top 1 * from chartest order by newid()

我跑了几次，得到了：

<<<<<<<<<<<<<<<<<<<<<<<<
f1           f2           f3        
==========   ==========   ==========
e            e            e         
1 row was affected.
>>>>>>>>>>>>>>>>>>>>>>>>
<<<<<<<<<<<<<<<<<<<<<<<<
f1           f2           f3        
==========   ==========   ==========
c            c            c         
1 row was affected.
>>>>>>>>>>>>>>>>>>>>>>>>
<<<<<<<<<<<<<<<<<<<<<<<<
f1           f2           f3        
==========   ==========   ==========
b            b            b         
1 row was affected.
>>>>>>>>>>>>>>>>>>>>>>>>
<<<<<<<<<<<<<<<<<<<<<<<<
f1           f2           f3        
==========   ==========   ==========
f            f            f         
1 row was affected.
>>>>>>>>>>>>>>>>>>>>>>>>