I just wrote this earlier today. It's a select statement working off the information_schema database, which produces the schema for the audit tables and the triggers.
SET GLOBAL group_concat_max_len = 1000;
SET @dbName = "[[[your_db_name_here]]]";
SELECT concat("DROP TABLE IF EXISTS `", @dbName, "`.`", table_data.audit_table, "`;\r",
"CREATE TABLE `", @dbName, "`.`", table_data.audit_table, "`\r",
"(\r",
" `auditAction` ENUM ('INSERT', 'UPDATE', 'DELETE'),\r",
" `auditTimestamp` DATETIME DEFAULT CURRENT_TIMESTAMP,\r",
" `auditId` INT(14) AUTO_INCREMENT,",
column_defs, ",\r"
" PRIMARY KEY (`auditId`),\r",
" INDEX (`auditTimestamp`)\r",
")\r",
" ENGINE = InnoDB;\r\r",
"DROP TRIGGER IF EXISTS `", @dbName, "`.`", table_data.insert_trigger, "`;\r",
"CREATE TRIGGER `", @dbName, "`.`", table_data.insert_trigger, "`\r",
" AFTER INSERT ON `", @dbName, "`.`", table_data.db_table, "`\r",
" FOR EACH ROW INSERT INTO `", @dbName, "`.`", table_data.audit_table, "`\r",
" (`auditAction`,", table_data.column_names, ")\r",
" VALUES\r",
" ('INSERT',", table_data.NEWcolumn_names, ");\r\r",
"DROP TRIGGER IF EXISTS `", @dbName, "`.`", table_data.update_trigger, "`;\r",
"CREATE TRIGGER `", @dbName, "`.`", table_data.update_trigger, "`\r",
" AFTER UPDATE ON `", @dbName, "`.`", table_data.db_table, "`\r",
" FOR EACH ROW INSERT INTO `", @dbName, "`.`", table_data.audit_table, "`\r",
" (`auditAction`,", table_data.column_names, ")\r",
" VALUES\r",
" ('UPDATE',", table_data.NEWcolumn_names, ");\r\r",
"DROP TRIGGER IF EXISTS `", @dbName, "`.`", table_data.delete_trigger, "`;\r",
"CREATE TRIGGER `", @dbName, "`.`", table_data.delete_trigger, "`\r",
" AFTER DELETE ON `", @dbName, "`.`", table_data.db_table, "`\r",
" FOR EACH ROW INSERT INTO `", @dbName, "`.`", table_data.audit_table, "`\r",
" (`auditAction`,", table_data.column_names, ")\r",
" VALUES\r",
" ('DELETE',", table_data.OLDcolumn_names, ");\r\r"
)
FROM (
# This select builds a derived table of table names with ordered and grouped column information in different
# formats as needed for audit table definitions and trigger definitions.
SELECT
table_order_key,
table_name AS db_table,
concat("audit_", table_name) AS audit_table,
concat(table_name, "_inserts") AS insert_trigger,
concat(table_name, "_updates") AS update_trigger,
concat(table_name, "_deletes") AS delete_trigger,
group_concat("\r `", column_name, "` ", column_type ORDER BY column_order_key) AS column_defs,
group_concat("`", column_name, "`" ORDER BY column_order_key) AS column_names,
group_concat("`NEW.", column_name, "`" ORDER BY column_order_key) AS NEWcolumn_names,
group_concat("`OLD.", column_name, "`" ORDER BY column_order_key) AS OLDcolumn_names
FROM
(
# This select builds a derived table of table names, column names and column types for
# non-audit tables of the specified db, along with ordering keys for later order by.
# The ordering must be done outside this select, as tables (including derived tables)
# are by definition unordered.
# We're only ordering so that the generated audit schema maintains a resemblance to the
# main schema.
SELECT
information_schema.tables.table_name AS table_name,
information_schema.columns.column_name AS column_name,
information_schema.columns.column_type AS column_type,
information_schema.tables.create_time AS table_order_key,
information_schema.columns.ordinal_position AS column_order_key
FROM information_schema.tables
JOIN information_schema.columns
ON information_schema.tables.table_name = information_schema.columns.table_name
WHERE information_schema.tables.table_schema = @dbName
AND information_schema.columns.table_schema = @dbName
AND information_schema.tables.table_name NOT LIKE "audit\_%"
) table_column_ordering_info
GROUP BY table_name
) table_data
ORDER BY table_order_key
INTO OUTFILE "[[[your_output_file]]]"
Best Answer
The UNION command should be your friend: http://dev.mysql.com/doc/refman/5.1/en/union.html
With UNION you can combine several SELECT results into one result. All selects must have the same field structure. In the MySQL docu there is a good example for your problem:
You create a select for each of your tables with all filter and sorting you need and combine them with UNION to one select. The result of it can be stored by INSERT INTO ... SELECT ... in an archive table. You can also store this query in a MySQL view to have live data of all three tables with one select - Depending on the execution time / indexes etc.