Question

I created one procedure called Sample1

delimiter ;;
drop procedure if exists Sample1;;
CREATE PROCEDURE Sample1(IN lft1 INT,IN rgt1 INT)
BEGIN
declare emp1 VARCHAR(20);
SELECT emp into emp1 FROM personnell WHERE lft>lft1 and rgt < rgt1;
insert into emp_val values (emp1);
END;;
call Sample1(1,12);;

My Table Structure is like the following:

---------------------
emp     lft     rgt
---------------------
Albert  1   12
Bert    2   3
Chuck   4   11
Donna   5   6
Eddie   7   8
Fred    9   10 
--------------------

It is executing well but i can get the result

IF the executed query having only one row means its coming and inserted that value into the table called emp_val.

but The executed query having more than one row means its showing the following error

Error

SQL query:

call Sample1( 1, 12 )

MySQL said: Documentation
#1172 - Result consisted of more than one row 

MY SUGGESTION

I have one suggestion to implementing array on it but how to use it i dont know any one help me.. 

Answer 1

If your select query can return multiple rows, then you can’t use an intermediate variable to store the query’s results. You can, however, use the insert ... select ... query format:

INSERT INTO emp_val SELECT emp FROM personnell WHERE lft>lft1 and rgt < rgt1;

which does it all in a single statement.