Get mysql data from two tables

Question

I have two tables like this:

Table 1

ID | COST |
1  | 601  |

Table 2

   ID | COST |
   1  | 1000 | 

I want to select data from this two tables. How to do this? I want output like this

[
  Table1 => [... data],
  Table2 => [...data]
]

Answer 1

if you want the rows from both the tables you could use union all

 select  cost
 from  table1 
 union all  
 select cost 
 from table2