Re: Stop multiple attendance at same event by person
PK on the first col, unique on the 2nd & 3rd works ...
drop table if exists t;
create table t( i int primary key, j int, k int, unique(j,k) );
insert into t values(1,1,1);
insert into t values(2,1,1);
ERROR 1062 (23000): Duplicate entry '1-1' for key 't.j'
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February 23, 2020 04:48AM
Re: Stop multiple attendance at same event by person
February 23, 2020 11:59AM
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