这样的事情可能会做。我还没有很多“带有日志的狗”来对此进行测试，但是我尝试了一个经过稍微编辑的版本，并且基本的想法似乎行得通。
SELECT @query:=CONCAT(
'select count(*) from ('
, GROUP_CONCAT( CONCAT( y.prefix, x.table_schema, y.postfix ) SEPARATOR ' UNION ALL ' )
, ') as total_count' )
FROM (
SELECT DISTINCT table_schema
FROM information_schema.tables
WHERE table_schema LIKE '%dog%'
) AS x
JOIN (
SELECT
'select * from ' AS prefix
, '.log where insane = 1' AS postfix
) AS y
;
-- SELECT @query AS Query;
PREPARE STMT FROM @query;
EXECUTE STMT;
DEALLOCATE PREPARE STMT;
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