diff --git a/src/service/club/member/memberService.ts b/src/service/club/member/memberService.ts
index f970a9f..d9080c1 100644
--- a/src/service/club/member/memberService.ts
+++ b/src/service/club/member/memberService.ts
@@ -5,6 +5,7 @@ import { membership } from "../../../entity/club/member/membership";
 import DatabaseActionException from "../../../exceptions/databaseActionException";
 import InternalException from "../../../exceptions/internalException";
 import { memberView } from "../../../views/memberView";
+import { DB_TYPE } from "../../../env.defaults";
 
 export default abstract class MemberService {
   /**
@@ -158,13 +159,17 @@ export default abstract class MemberService {
         "member.firstMembershipEntry",
         "member.memberships",
         "membership_first",
-        "membership_first.memberId = member.id AND membership_first.start = (SELECT MIN(m.start) FROM membership m WHERE m.memberId = member.id)"
+        DB_TYPE == "postgres"
+          ? 'membership_first.memberId = member.id AND membership_first.start = (SELECT MIN("m_first"."start") FROM "membership" "m_first" WHERE "m_first"."memberId" = "member"."id")'
+          : "membership_first.memberId = member.id AND membership_first.start = (SELECT MIN(m_first.start) FROM membership m_first WHERE m_first.memberId = member.id)"
       )
       .leftJoinAndMapOne(
         "member.lastMembershipEntry",
         "member.memberships",
         "membership_last",
-        "membership_last.memberId = member.id AND membership_last.start = (SELECT MAX(m.start) FROM membership m WHERE m.memberId = member.id)"
+        DB_TYPE == "postgres"
+          ? 'membership_last.memberId = member.id AND membership_last.start = (SELECT MAX("m_last"."start") FROM "membership" "m_last" WHERE "m_last"."memberId" = "member"."id")'
+          : "membership_last.memberId = member.id AND membership_last.start = (SELECT MAX(m_last.start) FROM membership m_last WHERE m_last.memberId = member.id)"
       )
       .leftJoinAndSelect("membership_first.status", "status_first")
       .leftJoinAndSelect("membership_last.status", "status_last")
@@ -172,17 +177,22 @@ export default abstract class MemberService {
         "member.preferredCommunication",
         "member.communications",
         "preferredCommunication",
-        "preferredCommunication.preferred = 1"
+        "preferredCommunication.preferred = true"
       )
       .leftJoinAndSelect("preferredCommunication.type", "communicationtype_preferred")
       .leftJoinAndMapOne(
         "member.sendNewsletter",
         "member.communications",
         "sendNewsletter",
-        "sendNewsletter.isSendNewsletter = 1"
+        "sendNewsletter.isSendNewsletter = true"
       )
       .leftJoinAndSelect("sendNewsletter.type", "communicationtype")
-      .leftJoinAndMapMany("member.smsAlarming", "member.communications", "smsAlarming", "smsAlarming.isSMSAlarming = 1")
+      .leftJoinAndMapMany(
+        "member.smsAlarming",
+        "member.communications",
+        "smsAlarming",
+        "smsAlarming.isSMSAlarming = true"
+      )
       .leftJoinAndSelect("smsAlarming.type", "communicationtype_smsAlarming")
       .leftJoinAndSelect("member.salutation", "salutation");
   }