CODE EXAMPLE FOR SQL

add column to all tables after first column mysql

SELECT CONCAT('ALTER TABLE ', table_schema,'.', TABLE_NAME,' ADD COLUMN `hash` VARCHAR(50) NULL DEFAULT UUID() AFTER ', first_column, ';') AS ddl

FROM (

	SELECT
		(
			SELECT `COLUMN_NAME`
			FROM `INFORMATION_SCHEMA`.`COLUMNS`
			WHERE `TABLE_SCHEMA`=t.TABLE_SCHEMA AND `TABLE_NAME`=t.TABLE_NAME
			LIMIT 1
		) AS 'first_column',
		t.*
	FROM
	information_schema.tables t
	WHERE table_schema = 'your_table_name' AND table_type = 'base table'
	
) AS x;