path: root/mysql-test/main/rownum.test

--source include/have_sequence.inc
#
# Test of basic rownum() functionallity
# Test are done with Aria to ensure that row order is stable
#

CREATE OR REPLACE TABLE t1(a int, b int) engine=aria;
CREATE OR REPLACE TABLE t2(a int, b int) engine=aria;
insert into t1 values (1,10),(2,20),(3,30);
insert into t2 values (2,21),(3,31),(4,41);

--echo #
--echo # Simple selects
--echo #

select a,b,rownum() from t1;
select a,b,rownum() from t1 where rownum() < 2;
select a,b from t1 where rownum() <= 2;
select a,b from t1 where rownum() > 2;

--echo #
--echo # Subqueries
--echo #

select t1.a,rownum(),t3.a,t3.t2_rownum from t1, (select t2.a,rownum() as t2_rownum from t2 where rownum() <=2) t3;
select t1.a, (select t2.b from t2 where t1.a=t2.a and rownum() <= 1) 'b' from t1;
select t1.a, t3.a from t1, (select * from t2 where rownum() <= 2) t3;
select * from (select tt.*,rownum() as id from (select * from t1) tt) t3 where id>2;

--echo #
--echo # Joins
--echo #

select t1.a,t1.b,t2.a,t2.b,rownum() from t1,t2 where rownum() <= 4;
select *,rownum() from t1,t2 where t1.a=t2.a and rownum()<=2;
select * from t1 left join t2 on (t2.a=t1.a and rownum()=0);
select * from t1 left join t2 on (t2.a=t1.a and rownum()>1);
select * from t1 left join t2 on (t2.a=t1.a and rownum()<1);
select * from t1 left join t2 on (t2.a=t1.a and rownum()=1);
select * from t1 left join t2 on (t2.a=t1.a and rownum()>=1);

--echo #
--echo # Union
--echo #

select * from t1 where rownum() <=2 union select * from t2 where rownum()<= 1;

--echo #
--echo # Order by
--echo #

select * from t1 where rownum() <= 2 order by a desc;
explain select * from t1 where rownum() <= 2 order by a desc;
select t1.a,t1.b,rownum() from t1 where rownum() <= 2 order by a desc;
explain select t1.a,t1.b,rownum() from t1 where rownum() <= 2 order by a desc;
select *,rownum() from t1,t2;
select *,rownum() from t1,t2 order by t2.a desc, t1.a desc;
select * from (select * from t1 order by a desc) as t where rownum() <= 2;
select * from t1,t2 where t1.a=t2.a and rownum()<=2 order by t1.a,t2.a;

--echo #
--echo # Having
--echo #

select t1.a, sum(t1.b), rownum() as 'r' from t1 group by t1.a having r <= 2;
select * from t1 having rownum() <= 2;
select t1.a, sum(t1.b), rownum() from t1 group by t1.a;
select t1.a, sum(t1.b), rownum() as 'r' from t1 group by t1.a having r <= 2;
select t1.a, sum(t1.b), rownum() as 'r' from t1 group by t1.a having rownum() <= 2;
select t1.a, sum(t1.b), rownum() as 'r' from t1 group by t1.a having r <= 2 order by a desc;
select t1.a, sum(t1.b), rownum() as 'r' from t1 group by t1.a having rownum() <= 2 order by a desc;

--echo #
--echo # Sum functions
--echo #

select max(rownum()),min(rownum()) from t1;
select sum(rownum()),avg(rownum()) from t1;

--echo #
--echo # Group by
--echo #

select t1.a,sum(t1.b) from t1 where rownum() < 2 group by t1.a;
select t1.a,sum(t2.b) from t1 JOIN t2 ON (t1.a=t2.a) where rownum() <= 2 group by t1.a;
select * from (select t1.a,sum(t2.b) from t1 JOIN t2 ON (t1.a=t2.a) group by t1.a) as t where rownum() <= 1;
select t1.a,sum(rownum()),count(*) from t1 where rownum() <= 2 group by t1.a;
select * from (select t1.a,sum(t1.b) from t1 group by t1.a) as t3 where rownum() < 2;

create table t3 (a int) engine=myisam;
insert into t3 values (3),(5),(5),(3);
select a, max(rownum()) from t3 group by a;
drop table t3;

CREATE TABLE t3 (
  a int(11) DEFAULT NULL,
  b varchar(1024) DEFAULT NULL
);
insert into t3 select mod(seq*3,20)+1, repeat(char(33+mod(seq,90)),mod(seq,10)*100) from seq_1_to_23;
#chack after fix MDEV-28571
--disable_view_protocol
SELECT sq.a,length(sq.f) FROM (SELECT a, GROUP_CONCAT(b,b) AS f FROM t3 GROUP BY a ORDER BY a desc) as sq WHERE ROWNUM() <= 10;
--enable_view_protocol
drop table t3;

--echo #
--echo # Prepared statements
--echo #

PREPARE stmt1 from "select a,b,rownum() from t1 where rownum() <= 2";
execute stmt1;
execute stmt1;
deallocate prepare stmt1;

--echo #
--echo # Views
--echo #

create view v1 as select t1.a,rownum() from t1;
select * from v1;
select t1.a,v1.* from t1,v1 where t1.a=v1.a;
drop view v1;

CREATE TABLE t3 (a INT);
INSERT INTO t3 VALUES (1),(2),(3);
CREATE VIEW v1 AS SELECT a FROM t3 WHERE ROWNUM() <= 2;
SELECT * FROM v1;
drop view v1;
drop table t3;

--echo #
--echo # Reserved words
--echo #

create table t4 (a int, rownum int);
insert into t4 (a,rownum) values (1,2);
select t4.a,t4.rownum from t4;
drop table t4;

--echo #
--echo # Test Oracle mode
--echo #

set SQL_MODE=ORACLE;
select t1.a,rownum from t1 where rownum<=2;
select t1.a,rownum() from t1 where rownum()<=2;
--error ER_PARSE_ERROR
create table t4 (a int, rownum int);

DELIMITER |;
DECLARE
   CURSOR c_cursor
   IS select a,b,rownum from t1 where rownum <= 2;
   v_a  t1.a%TYPE;
   v_b  t1.b%TYPE;
   v_rn t1.a%TYPE;
BEGIN
  OPEN c_cursor;
  FETCH c_cursor INTO v_a, v_b, v_rn;
  WHILE c_cursor%FOUND LOOP
     SELECT concat(v_a,'--',v_b,'--',v_rn);
     FETCH c_cursor INTO v_a, v_b, v_rn;
  END LOOP;
  CLOSE c_cursor;
END;|
DELIMITER ;|

select a, rownum from t1 group by a, rownum having rownum < 3;
select a, rownum as r from t1 group by a, rownum having r < 3;
select a, rownum from t1 group by a, rownum having "rownum" < 3;
select a, rownum from t1 group by a, rownum having rownum < 3 order by a desc;
select a, rownum as r from t1 group by a, rownum having r < 3 order by a desc;
select a, rownum from t1 group by a, rownum having "rownum" < 3 order by a desc;

set SQL_MODE=DEFAULT;

--echo # Cleanup

drop table t1,t2;

--echo #
--echo # INSERT
--echo #

create table t1 (a int not null primary key, b int);
insert into t1 values (1,rownum()),(2,rownum()),(3,rownum());
select * from t1;
drop table t1;

--echo #
--echo # INSERT DELAYED
--echo #

create table t1 (a int not null primary key, b int);
insert delayed into t1 values (1,rownum()),(2,rownum()),(3,rownum());
let $wait_condition= SELECT COUNT(*)=3 FROM t1;
source include/wait_condition.inc;
select * from t1;
drop table t1;

--echo #
--echo # INSERT IGNORED
--echo #

create table t1 (a int not null primary key, b int);
# with VALUES
insert ignore into t1 values (1,rownum()),(2,rownum()),(2,rownum()),(3,rownum());
select * from t1;
delete from t1;
# with SELECT
insert ignore into t1 select * from (values (1,rownum()),(2,rownum()),(2,rownum()),(3,rownum())) t;
select * from t1;
drop table t1;

--echo #
--echo # INSERT ... RETURNING
--echo #

create or replace table t1 (a int);
insert into t1 values (1),(2) returning a, rownum();
drop table t1;

--echo #
--echo # UPDATE
--echo #

create table t1 (a int not null primary key, b int);
insert into t1 values (1,1),(2,2),(3,3);
update t1 set b=0;
update t1 set b=rownum()+1;
select * from t1;

update t1 set b=0;
update t1 set b=rownum() where a < 10 and rownum() < 2;
select * from t1;
drop table t1;

create table t1 (a int);
insert into t1 values (10),(20),(30);
update t1 set a = rownum();
select * from t1;
update t1 set a = rownum();
select * from t1;
drop table t1;

--echo #
--echo # DELETE
--echo #

create table t1 (a int not null primary key, b int);
insert into t1 values (1,1),(2,0),(3,0);
delete from t1 where a < 10 and rownum() < 2;
select * from t1;
drop table t1;

--echo #
--echo # MULTI-TABLE-DELETE
--echo #

create table t1 (a int not null primary key);
insert into t1 values (1),(2),(3);
create table t2 (a int not null primary key);
insert into t2 values (1),(2),(3);

delete t1,t2 from t1,t2 where t1.a=t2.a and rownum() <= 2;
select * from t1;
select * from t2;
drop table t1,t2;

--echo #
--echo # MULTI-TABLE-UPDATE

CREATE TABLE t1 (ID INT);
CREATE TABLE t2 (ID INT,
  s1 TEXT, s2 TEXT, s3 VARCHAR(10), s4 TEXT, s5 VARCHAR(10));

INSERT INTO t1 VALUES (1),(2);
INSERT INTO t2 VALUES (1,'test', 'test', 'test', 'test', 'test'),
                      (2,'test', 'test', 'test', 'test', 'test');

SELECT * FROM t1 LEFT JOIN t2 USING(ID);
UPDATE t1 LEFT JOIN t2 USING(ID) SET s1 = 'changed';
select * from t2;
update t2 set s1="";
UPDATE t1 LEFT JOIN t2 USING(ID) SET s1 = 'changed' where rownum() <=1;
select * from t2;
drop table t1,t2;

--echo #
--echo # LOAD DATA
--echo #

create table t1 (a int, b int, c int);
load data infile '../../std_data/loaddata7.dat' into table t1 fields terminated by ',' lines terminated by "\r\n" (a,b) set c=rownum();
select * from t1;
drop table t1;

--echo #
--echo # LIMIT OPTIMIZATION
--echo #

create table t1 (a int);
insert into t1 select seq from seq_1_to_100;

flush status;
select * from t1 where rownum() <= 3;
show status like "Rows_read";
flush status;
select * from t1 where rownum() <= 4 and rownum() <= 3;
show status like "Rows_read";
flush status;
select * from t1 where rownum() < 4 and a > 10;
show status like "Rows_read";
flush status;
select * from t1 where 3 >= rownum();
show status like "Rows_read";
flush status;
select * from t1 where 4 > rownum() and a > 20;
show status like "Rows_read";
flush status;
select * from t1 where rownum() = 1 and a > 10;
show status like "Rows_read";
flush status;
select * from t1 where a > 30 && 1 = rownum();
show status like "Rows_read";
flush status;

--echo # No limit optimization

select * from t1 where rownum() > 10;
show status like "Rows_read";
flush status;
select * from t1 where 10 < rownum();
show status like "Rows_read";
flush status;
select * from t1 where rownum() >= 10;
show status like "Rows_read";
flush status;
select * from t1 where 10 < rownum();
show status like "Rows_read";
flush status;
select * from t1 where 10 <= rownum();
show status like "Rows_read";
flush status;
select * from t1 where 2 = rownum();
show status like "Rows_read";
flush status;
select * from t1 where rownum() = 2;
show status like "Rows_read";
flush status;
select * from t1 where rownum() <= 0;
show status like "Rows_read";
flush status;
select *,rownum() from t1 where rownum() < 10 limit 4, 4;
show status like "Rows_read";
flush status;
select * from t1 where rownum() < 10 order by a;
show status like "Rows_read";
flush status;


--echo # rownum and limit

select * from t1 where rownum() < 4 limit 10;
show status like "Rows_read";
flush status;
select * from t1 where rownum() < 10 limit 4;
show status like "Rows_read";

drop table t1;

--echo #
--echo # Rownum examples from Woqutech
--echo #

set SQL_MODE=ORACLE;
create table t1 (c1 int ,c2 varchar(20)) engine=myisam;
insert into t1 values (1, 'aaa'),(2, 'bbb'),(3, 'ccc'),(4, 'ddd'),(5, 'eee');
update t1 set c2 = 'xxx' where rownum = 2;
select * from t1 where c2='xxx';
update t1 set c2 = 'xxx' where  rownum < 3;
select * from t1 where c2='xxx';
delete from t1 where rownum = 2;
select count(*) from t1;
delete from t1 where rownum < 3;
select count(*) from t1;
delete from t1 where c1=rownum ;
select count(*) from t1;
delete from t1 where c1=rownum+2 ;
select count(*) from t1;
set SQL_MODE=DEFAULT;
drop table t1;

--echo #
--echo # Rownum() used in not supported places (returns 0 or gives an error)
--echo #

set @a=rownum();
select @a;

--error ER_GENERATED_COLUMN_FUNCTION_IS_NOT_ALLOWED
create or replace table t (a int, b int as (rownum()) virtual);

create table t1 (a int);
insert into t1 values (3),(1),(5),(8),(4);
handler t1 open;
--error ER_GENERATED_COLUMN_FUNCTION_IS_NOT_ALLOWED
handler t1 read next where rownum() < 1;
handler t1 close;
drop table t1;

# rownum() executed in a function will be run in the function context.

create table t1 (a int not null primary key, b int);
insert into t1 values (1,1),(2,2),(3,3);
create function f() returns int return rownum();
select a, rownum(), f() from t1;
drop function f;
drop table t1;

# rownum() executed in a trigger will be run in the function context.

create or replace table t1 (a int, r int);
create trigger tr before update on t1 for each row set NEW.r = rownum();
insert into t1 (a) values (1),(2);
select * from t1;
update t1 set a=a+10;
select * from t1;
drop trigger tr;
drop table t1;

--echo #
--echo # LIMIT optimisation
--echo #

create table t1 (a int);
insert into t1 values (1),(2),(3),(4),(5);

--disable_view_protocol
let $query=
select * from (select a from t1 where a < 1000) as tt where rownum() <= 2;
flush status;
eval $query;
show status like "Rows_read";
eval explain extended $query;
eval prepare stmt from "$query";
flush status;
execute stmt;
show status like "Rows_read";
flush status;
execute stmt;
show status like "Rows_read";
deallocate prepare stmt;


let $query=
select * from (select a from t1 where a < 1000 group by a) as tt where rownum() <= 2;
flush status;
eval $query;
show status like "Rows_read";
eval explain extended $query;
eval prepare stmt from "$query";
execute stmt;
execute stmt;
deallocate prepare stmt;

let $query=
select * from (select a from t1 where a < 1000 group by a order by 1) as tt where rownum() <= 2;
flush status;
eval $query;
show status like "Rows_read";
eval explain extended $query;
eval prepare stmt from "$query";
execute stmt;
execute stmt;
deallocate prepare stmt;

let $query=
select * from (select a from t1 where a < 1000 union select 10) as tt where rownum() <= 2;
flush status;
eval $query;
show status like "Rows_read";
eval explain extended $query;
eval prepare stmt from "$query";
execute stmt;
execute stmt;
deallocate prepare stmt;
--enable_view_protocol

--echo # Other limit

let $query=
select * from (select a from t1 where a < 1000 group by a order by 1 limit 1) as tt where rownum() <= 2;
eval $query;
eval explain extended $query;
eval prepare stmt from "$query";
execute stmt;
execute stmt;
deallocate prepare stmt;

--echo # Other limit less

let $query=
select * from (select a from t1 where a < 1000 group by a order by 1 limit 10) as tt where rownum() <= 2;
eval $query;
eval explain extended $query;
eval prepare stmt from "$query";
execute stmt;
execute stmt;
deallocate prepare stmt;

let $query=
select * from (select a from t1 where a < 1000 union select 10 limit 1) as tt where rownum() <= 2;
eval $query;
eval explain extended $query;
eval prepare stmt from "$query";
execute stmt;
execute stmt;
deallocate prepare stmt;

--echo # < rownum

let $query=
select * from (select a from t1 where a < 1000) as tt where rownum() < 2;
eval $query;
eval explain extended $query;
eval prepare stmt from "$query";
execute stmt;
execute stmt;
deallocate prepare stmt;

--echo # Simple expression

let $query=
select * from (select a from t1 where a < 1000) as tt where rownum() <= 1+1;
eval $query;
eval explain extended $query;
eval prepare stmt from "$query";
execute stmt;
execute stmt;
deallocate prepare stmt;

--echo # Simple expression reversed

let $query=
select * from (select a from t1 where a < 1000) as tt where  1+1 >= rownum();
eval $query;
eval explain extended $query;
eval prepare stmt from "$query";
execute stmt;
execute stmt;
deallocate prepare stmt;

--echo # expensive (no opt)

let $query=
select * from (select a from t1 where a < 1000) as tt where  (select max(a) from t1) >= rownum();
eval $query;
eval explain extended $query;
eval prepare stmt from "$query";
execute stmt;
execute stmt;
deallocate prepare stmt;

drop table t1;

--echo #
--echo # Table value constructors
--echo #
values ("first row"),("next row is 3"),(rownum()),("next row is 5"),(rownum());