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create table t1 ( c1 varchar(10), c2 varchar(10), c3 int );
insert into t1 values ("a" , "b", 1), ("a" , "b", 2);
create table t2 like t1 ;
alter table t2 add column c4 bigint unsigned as (CONV(LEFT(MD5(concat(c1,c2,c3)), 16), 16, 10)) persistent unique key;
select * into outfile 't1.csv' from t1;
load data infile 't1.csv' ignore into table t2 ;
Warnings:
Warning 1261 Row 1 doesn't contain data for all columns
Warning 1261 Row 2 doesn't contain data for all columns
select * from t2;
c1 c2 c3 c4
a b 1 7545402351885872315
a b 2 6048842355806993119
insert into t2 (c1,c2,c3) values ("a" , "b", 4);
select * from t2;
c1 c2 c3 c4
a b 1 7545402351885872315
a b 2 6048842355806993119
a b 4 15541743660496249717
drop table t1, t2;
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