mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-12-02 04:22:03 +00:00
36 lines
1.8 KiB
SQL
36 lines
1.8 KiB
SQL
create database if not exists test;
|
|
|
|
drop table if exists test.merge;
|
|
drop table if exists test.merge1;
|
|
drop table if exists test.merge2;
|
|
|
|
create table test.merge1 ( CounterID UInt32, StartDate Date, Sign Int8, VisitID UInt64, UserID UInt64, StartTime DateTime, ClickLogID UInt64) ENGINE = CollapsingMergeTree(StartDate, intHash32(UserID), tuple(CounterID, StartDate, intHash32(UserID), VisitID, ClickLogID), 8192, Sign);
|
|
insert into test.merge1 values (1, '2013-09-19', 1, 0, 2, '2013-09-19 12:43:06', 3);
|
|
|
|
create table test.merge2 ( CounterID UInt32, StartDate Date, Sign Int8, VisitID UInt64, UserID UInt64, StartTime DateTime, ClickLogID UInt64) ENGINE = CollapsingMergeTree(StartDate, intHash32(UserID), tuple(CounterID, StartDate, intHash32(UserID), VisitID, ClickLogID), 8192, Sign);
|
|
insert into test.merge2 values (2, '2013-09-19', 1, 0, 2, '2013-09-19 12:43:06', 3);
|
|
|
|
create table test.merge ( CounterID UInt32, StartDate Date, Sign Int8, VisitID UInt64, UserID UInt64, StartTime DateTime, ClickLogID UInt64) ENGINE = Merge(test, 'merge\[0-9\]');
|
|
|
|
alter table test.merge1 add column dummy String after CounterID;
|
|
alter table test.merge2 add column dummy String after CounterID;
|
|
alter table test.merge add column dummy String after CounterID;
|
|
|
|
describe table test.merge;
|
|
show create table test.merge;
|
|
|
|
insert into test.merge1 values (1, 'Hello, Alter Table!','2013-09-19', 1, 0, 2, '2013-09-19 12:43:06', 3);
|
|
|
|
select CounterID, dummy from test.merge where dummy <> '' limit 10;
|
|
|
|
|
|
alter table test.merge drop column dummy;
|
|
|
|
describe table test.merge;
|
|
show create table test.merge;
|
|
|
|
--error: must correctly fall into the alter
|
|
alter table test.merge add column dummy1 String after CounterID;
|
|
select CounterID, dummy1 from test.merge where dummy1 <> '' limit 10;
|
|
|