求助：多个MYSQL数据合并，每个数据库表一样，表属性一样

[oahzuw]

如:
db1
tab1
name age high ...
a 12 175 ...
b 13 160 ...
c 18 165 ...
tabn ..

db2
tab1
name age high ...
a 15 180 ...
b 13 160 ...
d 25 175 ...
tabn ..
合并后
db
tab
name age high ...
a 15 180 ...
b 13 160 ...
c 18 165 ...
d 25 175 ...
tabn ..

数据里的每个表都这样的合并，语句怎么写？
我试的这样不行 insert into db as select * from (select * from db1 union all select * from db2) as tmp;