SELECT *
FROM table
WHERE name REGEXP '^[a-zA-Z0-9 ]+$' AND name REGEXP '[0-9]'
По-просто:
SELECT *
FROM table
WHERE name REGEXP '^[a-zA-Z0-9 ]*[0-9][a-zA-Z0-9 ]*$'
SELECT *
FROM table
WHERE name REGEXP '^[a-zA-Z0-9 ]+$' AND name REGEXP '[0-9]'
По-просто:
SELECT *
FROM table
WHERE name REGEXP '^[a-zA-Z0-9 ]*[0-9][a-zA-Z0-9 ]*$'