diff --git a/src/controllers/SalaryController.ts b/src/controllers/SalaryController.ts
index f8522d1..2cbc612 100644
--- a/src/controllers/SalaryController.ts
+++ b/src/controllers/SalaryController.ts
@@ -211,6 +211,10 @@ export class Salary extends Controller {
           "ไม่สามารถลบไอดี: " + id + " ได้ เนื่องสถานะการใช้งานที่เป็น Default",
         );
       }
+      const del_SalaryRank = await this.salaryRankRepository.find({
+        where: { salaryId: chk_Salary.id }
+      });
+      await this.salaryRankRepository.remove(del_SalaryRank);
       await this.salaryRepository.remove(chk_Salary);
       return new HttpSuccess();
     } catch (error: any) {
diff --git a/src/entities/SalaryRanks.ts b/src/entities/SalaryRanks.ts
index a1a9c52..a703651 100644
--- a/src/entities/SalaryRanks.ts
+++ b/src/entities/SalaryRanks.ts
@@ -82,22 +82,22 @@ export class CreateSalaryRank {
   salary: number;
 
   @Column()
-  salaryHalf?: number;
+  salaryHalf?: number | null;
 
   @Column()
-  salaryHalfSpecial?: number;
+  salaryHalfSpecial?: number | null;
 
   @Column()
-  salaryFull?: number;
+  salaryFull?: number | null;
 
   @Column()
-  salaryFullSpecial?: number;
+  salaryFullSpecial?: number | null;
 
   @Column()
-  salaryFullHalf?: number;
+  salaryFullHalf?: number | null;
 
   @Column()
-  salaryFullHalfSpecial?: number;
+  salaryFullHalfSpecial?: number | null;
 
   @Column()
   isNext: boolean;