USE tpch1;
select rand(0) from region;
rand(0)
0.15522042769493574
0.620881741513388
0.6387474552157777
0.33109208227236947
0.7392180764481594
select rand(-2) from region order by 1;
rand(-2)
0.11941688239520125
0.12422665872073421
0.6325218050112219
0.6548542125661431
0.804358408604151
select rand(2) from region order by rand(1);
rand(2)
0.354211017819318
0.8578261098431667
0.64497318737672
0.6555866465490187
0.12234661925802624
select * from (select n_nationkey, rand(1) from nation limit 1) x;
n_nationkey	rand(1)
0	0.40540353712197724
select * from (select n_nationkey from nation order by rand(1) limit 1 )a;
n_nationkey
22
select rand(r_regionkey) from region;
rand(r_regionkey)
0.15522042769493574
0.40540353712197724
0.6555866465490187
0.9057697559760601
0.15595286540310166
select rand(r_name) from region;
rand(r_name)
0.15522042769493574
0.15522042769493574
0.15522042769493574
0.15522042769493574
0.15522042769493574