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CREATE TABLE mytable( id INTEGER NOT NULL PRIMARY KEY ,did INTEGER NOT NULL ,grp_concat VARCHAR(6) NOT NULL ); INSERT INTO mytable(id,did,grp_concat) VALUES (1,1,'1,1,1'); INSERT INTO mytable(id,did,grp_concat) VALUES (2,1,'0'); INSERT INTO mytable(id,did,grp_concat) VALUES (3,2,'1,-1'); INSERT INTO mytable(id,did,grp_concat) VALUES (4,2,'1,-1,0'); INSERT INTO mytable(id,did,grp_concat) VALUES (5,2,'0,0,0'); INSERT INTO mytable(id,did,grp_concat) VALUES (6,3,'2,-2'); INSERT INTO mytable(id,did,grp_concat) VALUES (7,3,'1,-1,0'); INSERT INTO mytable(id,did,grp_concat) VALUES (8,3,'0,0,0');
select t.did, sum(substring_index(substring_index(grp_concat, ',', n.n), ',', - 1)) sum_of_grp_concat from mytable t inner join (select 1 n union all select 2 union all select 3 union all select 4 union all select 5) n on n.n <= 1 + char_length(grp_concat) - char_length(replace(grp_concat, ',', '')) group by t.did having sum_of_grp_concat = 0
did
sum_of_grp_concat
2
0
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0