How to Create View or Table from Prepared Statement (Select Query) - mysql

Question

I am trying to create View from the following prepared statement:
CREATE VIEW myview AS -- this line is not working
SELECT CONCAT(GROUP_CONCAT('SELECT ''', COLUMN_NAME,''' MyColumns, SUM(`', COLUMN_NAME,'`) Total FROM mydb.source_table' SEPARATOR '\n UNION ALL \n'),'\nORDER BY Total ASC')
INTO #sql
FROM INFORMATION_SCHEMA.COLUMNS
WHERE TABLE_SCHEMA = 'mydb'
AND TABLE_NAME = 'source_table'
AND COLUMN_NAME NOT IN ('ID', 'Name');
PREPARE stmt FROM #sql;
EXECUTE stmt;
DROP PREPARE stmt;
I am still confused with handling group_concat syntax.
I just need help on how to create View with the above prepared statement.
UPDATE 1: Stored procedure
As suggested by #nbk, I have to create into 5 stored procedures in single column to be able the data and use it to CREATE TABLE query. Here's the stored procedure version of the above codes.
CREATE DEFINER=`admin`#`%` PROCEDURE `sp_result`()
BEGIN
SELECT CONCAT(GROUP_CONCAT('SELECT ''', COLUMN_NAME,''' MyColumns FROM mydb.source_table' SEPARATOR '\n UNION ALL \n'), '\n LIMIT 0, 1 \n')
INTO #sql
FROM INFORMATION_SCHEMA.COLUMNS
WHERE TABLE_SCHEMA = 'mydb'
AND TABLE_NAME = 'source_table'
AND COLUMN_NAME NOT IN ('ID', 'Name');
PREPARE stmt FROM #sql;
EXECUTE stmt;
DROP PREPARE stmt;
END
Here's the result of this stored procedure:
+-----------+
| MyColumns |
+-----------+
| Abc |
+-----------+
In order this approach to be useful to me, I want the above result to be the one of the column of my CREATE TABLE query:
Here are my attempts but no luck:
First attempt: Separate Query
CREATE TABLE my_table AS SELECT id, name, mydb.sp_result() FROM source_table; -- Error Code: 1305. FUNCTION project_x.best_vendor1_name does not exist
Second attempt: Inserted at the last part of the stored procedure
CREATE TABLE my_table AS SELECT #sql FROM source_table; -- no effect
Here, I really do not know how CREATE TABLE using the stored procedure returned data.
UPDATE 2: Illustrate Encapsulation
CREATE DEFINER=`root`#`%` PROCEDURE `proc_column_sum`()
BEGIN
DROP TABLE IF EXISTS table2;
SELECT CONCAT('
CREATE TABLE table2 AS (',GROUP_CONCAT('
SELECT ''', COLUMN_NAME,''' MyColumns, SUM(`', COLUMN_NAME,'`) Total
FROM testdb.products '
SEPARATOR '\n UNION ALL \n'), -- runtime syntax error somewhere here
'\n ORDER BY Total ASC)') -- missing closing single quote right after ASC
INTO #sql
FROM INFORMATION_SCHEMA.COLUMNS
WHERE TABLE_SCHEMA = 'testdb'
AND TABLE_NAME = 'products'
AND COLUMN_NAME NOT IN ('ID', 'Name');
PREPARE stmt FROM #sql;
EXECUTE stmt;
DROP PREPARE stmt;
END

Answer 1

You must put the CREATE TABLE in your prepared statement.
this example uses a temporary table only for demonstration purposes
CREATE DEFINER=`root`#`%` PROCEDURE `proc_column_sum`()
BEGIN
SELECT
CONCAT('CREATE TEMPORARY TABLE IF NOT EXISTS table2 AS (',GROUP_CONCAT('SELECT ''', COLUMN_NAME,''' MyColumns, SUM(`', COLUMN_NAME,'`) Total FROM testdb.products ' SEPARATOR '\n UNION ALL \n'),'\nORDER BY Total ASC)')
INTO #sql
FROM INFORMATION_SCHEMA.COLUMNS
WHERE TABLE_SCHEMA = 'testdb'
AND TABLE_NAME = 'products'
AND COLUMN_NAME NOT IN ('ID', 'Name');
PREPARE stmt FROM #sql;
EXECUTE stmt;
DROP PREPARE stmt;
END
you call it then
call proc_column_sum();
SELECT * FROM table2
But with this approach you have call every time the procedure to get the newest data.
I can' figure out, what went wrong in your query
CREATE DEFINER=`root`#`%` PROCEDURE `proc_column_sum`()
BEGIN
DROP TABLE IF EXISTS table2;
SELECT CONCAT('
CREATE TABLE IF NOT EXISTS table2 AS (',GROUP_CONCAT('
SELECT ''', COLUMN_NAME,''' MyColumns, SUM(`', COLUMN_NAME,'`) Total
FROM testdb.products '
SEPARATOR '\n UNION ALL \n')
,'\nORDER BY Total ASC)')
INTO #sql
FROM INFORMATION_SCHEMA.COLUMNS
WHERE TABLE_SCHEMA = 'testdb'
AND TABLE_NAME = 'products'
AND COLUMN_NAME NOT IN ('ID', 'Name');
PREPARE stmt FROM #sql;
EXECUTE stmt;
DROP PREPARE stmt;
END