union all in azure data explorer

Hi Team,

I have a data from two queries:

let query1=view()
{
let source1=(a|project col1,col2);
source1
};

let query2=view()
{
let source2=(b|project col1,col2);
source1
};

and the query1 results set data is like 1,hyd
and the query2 results set data is like 2,chennai

i want to perform the union all operation to get the data from both the queries results

1,hyd
2,chennai like this

Can someone help on this.