Parameter substitution problem

[wangbowen1024]

in a sql task, i have many table names with similar names , such as:
dws_t1_table
dws_t2_table
dws_t3_table
dws_t4_table

if i use dws_${type}_table, and the param value is t1 , then will become dws_'t1'_table. So i have to create a lot of workflow defines or tasks, it looks so terrible