PHP汇总一句话到mysql查询[关闭]

Question

I have a query

"select * from test";

I have to add UNION after test

"select * from test union"

It is not concat.

How do I add union to the query?

update

select * from x where id = "2" union select * from y where id = "2" union select * from z where id = "2"
select * from x where id = "3" union select * from y where id = "3" union select * from z where id = "3"

See select statement id = 3 ,union is missing. Now,i've to add this union in the query to execute and remove last extra union and pass the query to mysql_query() function.

Answer 1

$var1 = "Select * from test";
$vart2 = "union";
$vart3  =  var1." ".var2;
echo $var3;