diff --git a/CHANGELOG.md b/CHANGELOG.md
index bc2653c83..b36dad1ce 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,9 @@
 [Full Changelog](https://github.com/parse-community/Parse-Swift/compare/1.8.0...main)
 * _Contributing to this repo? Add info about your change here to be included in the next release_
 
+__Improvements__
+- Append instead of replace when using query select, exclude, include, and fields ([#155](https://github.com/parse-community/Parse-Swift/pull/155)), thanks to [Corey Baker](https://github.com/cbaker6).
+
 ### 1.8.0
 [Full Changelog](https://github.com/parse-community/Parse-Swift/compare/1.7.2...1.8.0)
 
diff --git a/Sources/ParseSwift/LiveQuery/Messages.swift b/Sources/ParseSwift/LiveQuery/Messages.swift
index e1d4c5be5..41436f475 100644
--- a/Sources/ParseSwift/LiveQuery/Messages.swift
+++ b/Sources/ParseSwift/LiveQuery/Messages.swift
@@ -38,7 +38,7 @@ struct StandardMessage: LiveQueryable, Codable {
 struct SubscribeQuery: Encodable {
     let className: String
     let `where`: QueryWhere
-    let fields: [String]?
+    let fields: Set<String>?
 }
 
 struct SubscribeMessage<T: ParseObject>: LiveQueryable, Encodable {
diff --git a/Sources/ParseSwift/Types/Query.swift b/Sources/ParseSwift/Types/Query.swift
index 31770d24b..2e6494ed3 100644
--- a/Sources/ParseSwift/Types/Query.swift
+++ b/Sources/ParseSwift/Types/Query.swift
@@ -633,20 +633,20 @@ public struct Query<T>: Encodable, Equatable where T: ParseObject {
     private let method: String = "GET"
     internal var limit: Int = 100
     internal var skip: Int = 0
-    internal var keys: [String]?
-    internal var include: [String]?
+    internal var keys: Set<String>?
+    internal var include: Set<String>?
     internal var order: [Order]?
     internal var isCount: Bool?
     internal var explain: Bool?
     internal var hint: AnyEncodable?
     internal var `where` = QueryWhere()
-    internal var excludeKeys: [String]?
+    internal var excludeKeys: Set<String>?
     internal var readPreference: String?
     internal var includeReadPreference: String?
     internal var subqueryReadPreference: String?
     internal var distinct: String?
     internal var pipeline: [[String: AnyEncodable]]?
-    internal var fields: [String]?
+    internal var fields: Set<String>?
 
     /**
       An enum that determines the order to sort the results based on a given key.
@@ -768,21 +768,31 @@ public struct Query<T>: Encodable, Equatable where T: ParseObject {
 
     /**
      Make the query include `ParseObject`s that have a reference stored at the provided keys.
+     If this is called multiple times, then all of the keys specified in each of the calls will be included.
      - parameter keys: A variadic list of keys to load child `ParseObject`s for.
      */
     public func include(_ keys: String...) -> Query<T> {
         var mutableQuery = self
-        mutableQuery.include = keys
+        if mutableQuery.include != nil {
+            mutableQuery.include = mutableQuery.include?.union(keys)
+        } else {
+            mutableQuery.include = Set(keys)
+        }
         return mutableQuery
     }
 
     /**
      Make the query include `ParseObject`s that have a reference stored at the provided keys.
+     If this is called multiple times, then all of the keys specified in each of the calls will be included.
      - parameter keys: An array of keys to load child `ParseObject`s for.
      */
     public func include(_ keys: [String]) -> Query<T> {
         var mutableQuery = self
-        mutableQuery.include = keys
+        if mutableQuery.include != nil {
+            mutableQuery.include = mutableQuery.include?.union(keys)
+        } else {
+            mutableQuery.include = Set(keys)
+        }
         return mutableQuery
     }
 
@@ -797,24 +807,34 @@ public struct Query<T>: Encodable, Equatable where T: ParseObject {
     }
 
     /**
-     Exclude specific keys for a `ParseObject`. Default is to nil.
+     Exclude specific keys for a `ParseObject`.
+     If this is called multiple times, then all of the keys specified in each of the calls will be excluded.
      - parameter keys: A variadic list of keys include in the result.
      - warning: Requires Parse Server > 4.5.0.
      */
     public func exclude(_ keys: String...) -> Query<T> {
         var mutableQuery = self
-        mutableQuery.excludeKeys = keys
+        if mutableQuery.excludeKeys != nil {
+            mutableQuery.excludeKeys = mutableQuery.excludeKeys?.union(keys)
+        } else {
+            mutableQuery.excludeKeys = Set(keys)
+        }
         return mutableQuery
     }
 
     /**
-     Exclude specific keys for a `ParseObject`. Default is to nil.
-     - parameter keys: An array of keys to exclude.
+     Exclude specific keys for a `ParseObject`.
+     If this is called multiple times, then all of the keys specified in each of the calls will be excluded.
+     - parameter keys: An array of keys to exclude in the result.
      - warning: Requires Parse Server > 4.5.0.
     */
     public func exclude(_ keys: [String]) -> Query<T> {
         var mutableQuery = self
-        mutableQuery.excludeKeys = keys
+        if mutableQuery.excludeKeys != nil {
+            mutableQuery.excludeKeys = mutableQuery.excludeKeys?.union(keys)
+        } else {
+            mutableQuery.excludeKeys = Set(keys)
+        }
         return mutableQuery
     }
 
@@ -826,7 +846,11 @@ public struct Query<T>: Encodable, Equatable where T: ParseObject {
      */
     public func select(_ keys: String...) -> Query<T> {
         var mutableQuery = self
-        mutableQuery.keys = keys
+        if mutableQuery.keys != nil {
+            mutableQuery.keys = mutableQuery.keys?.union(keys)
+        } else {
+            mutableQuery.keys = Set(keys)
+        }
         return mutableQuery
     }
 
@@ -838,7 +862,11 @@ public struct Query<T>: Encodable, Equatable where T: ParseObject {
      */
     public func select(_ keys: [String]) -> Query<T> {
         var mutableQuery = self
-        mutableQuery.keys = keys
+        if mutableQuery.keys != nil {
+            mutableQuery.keys = mutableQuery.keys?.union(keys)
+        } else {
+            mutableQuery.keys = Set(keys)
+        }
         return mutableQuery
     }
 
@@ -859,13 +887,18 @@ public struct Query<T>: Encodable, Equatable where T: ParseObject {
      If you are only interested in the change of the name field, you can set `query.fields` to "name".
      In this situation, when the change of a Player `ParseObject` fulfills the subscription, only the
      name field will be sent to the clients instead of the full Player `ParseObject`.
+     If this is called multiple times, then all of the keys specified in each of the calls will be received.
      - warning: This is only for `ParseLiveQuery`.
      - parameter keys: A variadic list of fields to receive back instead of the whole `ParseObject`.
      */
     @available(macOS 10.15, iOS 13.0, macCatalyst 13.0, watchOS 6.0, tvOS 13.0, *)
     public func fields(_ keys: String...) -> Query<T> {
         var mutableQuery = self
-        mutableQuery.fields = keys
+        if mutableQuery.fields != nil {
+            mutableQuery.fields = mutableQuery.fields?.union(keys)
+        } else {
+            mutableQuery.fields = Set(keys)
+        }
         return mutableQuery
     }
 
@@ -876,13 +909,18 @@ public struct Query<T>: Encodable, Equatable where T: ParseObject {
      If you are only interested in the change of the name field, you can set `query.fields` to "name".
      In this situation, when the change of a Player `ParseObject` fulfills the subscription, only the
      name field will be sent to the clients instead of the full Player `ParseObject`.
+     If this is called multiple times, then all of the keys specified in each of the calls will be received.
      - warning: This is only for `ParseLiveQuery`.
      - parameter keys: An array of fields to receive back instead of the whole `ParseObject`.
      */
     @available(macOS 10.15, iOS 13.0, macCatalyst 13.0, watchOS 6.0, tvOS 13.0, *)
     public func fields(_ keys: [String]) -> Query<T> {
         var mutableQuery = self
-        mutableQuery.fields = keys
+        if mutableQuery.fields != nil {
+            mutableQuery.fields = mutableQuery.fields?.union(keys)
+        } else {
+            mutableQuery.fields = Set(keys)
+        }
         return mutableQuery
     }
 
diff --git a/Tests/ParseSwiftTests/ParseLiveQueryTests.swift b/Tests/ParseSwiftTests/ParseLiveQueryTests.swift
index 47d555ce5..c91f77706 100644
--- a/Tests/ParseSwiftTests/ParseLiveQueryTests.swift
+++ b/Tests/ParseSwiftTests/ParseLiveQueryTests.swift
@@ -193,7 +193,7 @@ class ParseLiveQueryTests: XCTestCase {
         // swiftlint:disable:next line_length
         let expected = "{\"op\":\"subscribe\",\"requestId\":1,\"query\":{\"className\":\"GameScore\",\"where\":{\"score\":{\"$gt\":9}},\"fields\":[\"score\"]}}"
         let query = GameScore.query("score" > 9)
-            .fields("score")
+            .fields(["score"])
         let message = SubscribeMessage(operation: .subscribe,
                                        requestId: RequestId(value: 1),
                                        query: query,
@@ -204,6 +204,32 @@ class ParseLiveQueryTests: XCTestCase {
         XCTAssertEqual(decoded, expected)
     }
 
+    func testFieldKeys() throws {
+        let query = GameScore.query()
+        XCTAssertNil(query.keys)
+
+        var query2 = GameScore.query().fields(["yolo"])
+        XCTAssertEqual(query2.fields?.count, 1)
+        XCTAssertEqual(query2.fields?.first, "yolo")
+
+        query2 = query2.fields(["hello", "wow"])
+        XCTAssertEqual(query2.fields?.count, 3)
+        XCTAssertEqual(query2.fields, ["yolo", "hello", "wow"])
+    }
+
+    func testFieldKeysVariadic() throws {
+        let query = GameScore.query()
+        XCTAssertNil(query.keys)
+
+        var query2 = GameScore.query().fields("yolo")
+        XCTAssertEqual(query2.fields?.count, 1)
+        XCTAssertEqual(query2.fields?.first, "yolo")
+
+        query2 = query2.fields("hello", "wow")
+        XCTAssertEqual(query2.fields?.count, 3)
+        XCTAssertEqual(query2.fields, ["yolo", "hello", "wow"])
+    }
+
     func testRedirectResponseDecoding() throws {
         guard let url = URL(string: "http://parse.org") else {
             XCTFail("Should have url")
diff --git a/Tests/ParseSwiftTests/ParseQueryTests.swift b/Tests/ParseSwiftTests/ParseQueryTests.swift
index 92a1f512f..6e00c38f8 100644
--- a/Tests/ParseSwiftTests/ParseQueryTests.swift
+++ b/Tests/ParseSwiftTests/ParseQueryTests.swift
@@ -157,15 +157,23 @@ class ParseQueryTests: XCTestCase { // swiftlint:disable:this type_body_length
     func testIncludeKeys() {
         let query = GameScore.query()
         XCTAssertNil(query.include)
-        var query2 = GameScore.query().include("yolo")
+        var query2 = GameScore.query().include(["yolo"])
         XCTAssertEqual(query2.include?.count, 1)
         XCTAssertEqual(query2.include?.first, "yolo")
-        query2 = query2.include("yolo", "wow")
-        XCTAssertEqual(query2.include?.count, 2)
-        XCTAssertEqual(query2.include, ["yolo", "wow"])
-        query2 = query2.include(["yolo"])
+        query2 = query2.include(["hello", "wow"])
+        XCTAssertEqual(query2.include?.count, 3)
+        XCTAssertEqual(query2.include, Set(["yolo", "hello", "wow"]))
+    }
+
+    func testIncludeKeysVariadic() {
+        let query = GameScore.query()
+        XCTAssertNil(query.include)
+        var query2 = GameScore.query().include("yolo")
         XCTAssertEqual(query2.include?.count, 1)
-        XCTAssertEqual(query2.include, ["yolo"])
+        XCTAssertEqual(query2.include?.first, "yolo")
+        query2 = query2.include("hello", "wow")
+        XCTAssertEqual(query2.include?.count, 3)
+        XCTAssertEqual(query2.include, Set(["yolo", "hello", "wow"]))
     }
 
     func testIncludeAllKeys() {
@@ -179,8 +187,33 @@ class ParseQueryTests: XCTestCase { // swiftlint:disable:this type_body_length
     func testExcludeKeys() throws {
         let query = GameScore.query()
         XCTAssertNil(query.excludeKeys)
-        var query2 = GameScore.query().exclude("yolo")
+        var query2 = GameScore.query().exclude(["yolo"])
         XCTAssertEqual(query2.excludeKeys, ["yolo"])
+        let encoded = try ParseCoding.jsonEncoder().encode(query2)
+        let decodedDictionary = try JSONDecoder().decode([String: AnyCodable].self, from: encoded)
+        guard let decodedKeys = decodedDictionary["excludeKeys"],
+            let decodedValues = decodedKeys.value as? [String] else {
+            XCTFail("Should have casted")
+            return
+        }
+        XCTAssertEqual(decodedValues, ["yolo"])
+
+        query2 = query2.exclude(["hello", "wow"])
+        XCTAssertEqual(query2.excludeKeys, ["yolo", "hello", "wow"])
+        let encoded2 = try ParseCoding.jsonEncoder().encode(query2)
+        let decodedDictionary2 = try JSONDecoder().decode([String: AnyCodable].self, from: encoded2)
+        guard let decodedKeys2 = decodedDictionary2["excludeKeys"],
+            let decodedValues2 = decodedKeys2.value as? [String] else {
+            XCTFail("Should have casted")
+            return
+        }
+        XCTAssertEqual(Set(decodedValues2), Set(["yolo", "hello", "wow"]))
+    }
+
+    func testExcludeKeysVariadic() throws {
+        let query = GameScore.query()
+        XCTAssertNil(query.excludeKeys)
+        var query2 = GameScore.query().exclude("yolo")
         XCTAssertEqual(query2.excludeKeys, ["yolo"])
         let encoded = try ParseCoding.jsonEncoder().encode(query2)
         let decodedDictionary = try JSONDecoder().decode([String: AnyCodable].self, from: encoded)
@@ -191,9 +224,8 @@ class ParseQueryTests: XCTestCase { // swiftlint:disable:this type_body_length
         }
         XCTAssertEqual(decodedValues, ["yolo"])
 
-        query2 = GameScore.query().exclude(["yolo", "wow"])
-        XCTAssertEqual(query2.excludeKeys, ["yolo", "wow"])
-        XCTAssertEqual(query2.excludeKeys, ["yolo", "wow"])
+        query2 = query2.exclude("hello", "wow")
+        XCTAssertEqual(query2.excludeKeys, ["yolo", "hello", "wow"])
         let encoded2 = try ParseCoding.jsonEncoder().encode(query2)
         let decodedDictionary2 = try JSONDecoder().decode([String: AnyCodable].self, from: encoded2)
         guard let decodedKeys2 = decodedDictionary2["excludeKeys"],
@@ -201,13 +233,42 @@ class ParseQueryTests: XCTestCase { // swiftlint:disable:this type_body_length
             XCTFail("Should have casted")
             return
         }
-        XCTAssertEqual(decodedValues2, ["yolo", "wow"])
+        XCTAssertEqual(Set(decodedValues2), Set(["yolo", "hello", "wow"]))
     }
 
     func testSelectKeys() throws {
         let query = GameScore.query()
         XCTAssertNil(query.keys)
 
+        var query2 = GameScore.query().select(["yolo"])
+        XCTAssertEqual(query2.keys?.count, 1)
+        XCTAssertEqual(query2.keys?.first, "yolo")
+        let encoded = try ParseCoding.jsonEncoder().encode(query2)
+        let decodedDictionary = try JSONDecoder().decode([String: AnyCodable].self, from: encoded)
+        guard let decodedKeys = decodedDictionary["keys"],
+            let decodedValues = decodedKeys.value as? [String] else {
+            XCTFail("Should have casted")
+            return
+        }
+        XCTAssertEqual(decodedValues, ["yolo"])
+
+        query2 = query2.select(["hello", "wow"])
+        XCTAssertEqual(query2.keys?.count, 3)
+        XCTAssertEqual(query2.keys, ["yolo", "hello", "wow"])
+        let encoded2 = try ParseCoding.jsonEncoder().encode(query2)
+        let decodedDictionary2 = try JSONDecoder().decode([String: AnyCodable].self, from: encoded2)
+        guard let decodedKeys2 = decodedDictionary2["keys"],
+            let decodedValues2 = decodedKeys2.value as? [String] else {
+            XCTFail("Should have casted")
+            return
+        }
+        XCTAssertEqual(Set(decodedValues2), Set(["yolo", "hello", "wow"]))
+    }
+
+    func testSelectKeysVariadic() throws {
+        let query = GameScore.query()
+        XCTAssertNil(query.keys)
+
         var query2 = GameScore.query().select("yolo")
         XCTAssertEqual(query2.keys?.count, 1)
         XCTAssertEqual(query2.keys?.first, "yolo")
@@ -220,9 +281,9 @@ class ParseQueryTests: XCTestCase { // swiftlint:disable:this type_body_length
         }
         XCTAssertEqual(decodedValues, ["yolo"])
 
-        query2 = query2.select(["yolo", "wow"])
-        XCTAssertEqual(query2.keys?.count, 2)
-        XCTAssertEqual(query2.keys, ["yolo", "wow"])
+        query2 = query2.select("hello", "wow")
+        XCTAssertEqual(query2.keys?.count, 3)
+        XCTAssertEqual(query2.keys, ["yolo", "hello", "wow"])
         let encoded2 = try ParseCoding.jsonEncoder().encode(query2)
         let decodedDictionary2 = try JSONDecoder().decode([String: AnyCodable].self, from: encoded2)
         guard let decodedKeys2 = decodedDictionary2["keys"],
@@ -230,7 +291,7 @@ class ParseQueryTests: XCTestCase { // swiftlint:disable:this type_body_length
             XCTFail("Should have casted")
             return
         }
-        XCTAssertEqual(decodedValues2, ["yolo", "wow"])
+        XCTAssertEqual(Set(decodedValues2), Set(["yolo", "hello", "wow"]))
     }
 
     func testAddingConstraints() {