sql合并数据表，有多条变成一条解决思路

create table t1(id int ,name varchar(20),c1 varchar(20),c2 varchar(20),c3 varchar(20) );insert into t1 values (1,'wc','as','','');insert into t1 values (2,'wc','asd','','');insert into t1 values (3,'wc','','fdf','');insert into t1 values (4,'wc','','','er');insert into t1 values (5,'wd','fg','','');insert into t1 values (6,'wd','fgo','','');insert into t1 values (7 ,'wd','','ko',''); commit;select name,       substr(c1,instr(c1,',',-1)+1,length(c1)) c1,       substr(c2,instr(c2,',',-1)+1,length(c2)) c2,       substr(c3,instr(c3,',',-1)+1,length(c3)) c3from (select name,         wm_concat(c1) c1,         wm_concat(c2) c2,         wm_concat(c3) c3     from t1     group by name)     name    c1    c2    c3----------------------------------------1    wc    asd    fdf    er2    wd    fgo    ko