You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
 
 

20 lines
582 B

drop table if exists t;
create table t (id int, c1 timestamp);
show columns from t;
explain t;
describe t;
desc t;
desc t c1;
desc t id;
drop table if exists t;
create table t(id int primary key, a int, b int);
set session tidb_hashagg_partial_concurrency = 1;
set session tidb_hashagg_final_concurrency = 1;
explain select group_concat(a) from t group by id;
explain select group_concat(a, b) from t group by id;
drop table t;
drop view if exists v;
create view v as select cast(replace(substring_index(substring_index("",',',1),':',-1),'"','') as CHAR(32)) as event_id;
desc v;