I have an error for using joins (SQLSTATE[23000]: Integrity constraint violation: 1052 Column 'created_at' in where clause is ambiguous).

[mani1430]

I have an error for selecting flatpicker. please give me a solution.

[codemasterjoel]

where it says created_at place the name of the table followed by a point example erp_customer_masters.created_at

[Kakad3v]

This is the solution