diff --git a/README.md b/README.md
index 7a7f292..e775dd5 100644
--- a/README.md
+++ b/README.md
@@ -7,6 +7,7 @@
 [![Kotlin](https://img.shields.io/badge/Kotlin-2.2.21+-purple.svg?style=flat&logo=kotlin)](https://kotlinlang.org)
 [![Android](https://img.shields.io/badge/Android-API%2021+-green.svg?style=flat&logo=android)](https://developer.android.com)
 [![Room](https://img.shields.io/badge/Room-Compatible-blue.svg?style=flat)](https://developer.android.com/training/data-storage/room)
+[![Retrofit](https://img.shields.io/badge/Retrofit-Compatible-red.svg?style=flat)]([https://developer.android.com/training/data-storage/room](https://square.github.io/retrofit/))
 ![GitHub release (latest by date)](https://img.shields.io/github/v/release/LeandroLCD/android-sql-query)
 [![Run Query Unit Tests](https://github.com/LeandroLCD/android-sql-query/actions/workflows/run-query-tests.yml/badge.svg)](https://github.com/LeandroLCD/android-sql-query/actions/workflows/run-query-tests.yml)
 
@@ -35,7 +36,7 @@ Diseñada para integrarse perfectamente con la base de datos de Android y Room a
   - [DELETE](#-delete)
   - [INNER JOIN](#-inner-join)
 - [🔗 Integración con Room](#-integración-con-room)
-- [📡 RepeatedQueryParameters](#-repeatedqueryparameters)
+- [📡 Integración con retrofit -> RepeatedQueryParameters](#-repeatedqueryparameters)
 - [📝 Ejemplos Avanzados](#-ejemplos-avanzados)
 - [🤝 Contribuir](#-contribuir)
 
diff --git a/gradle/libs.versions.toml b/gradle/libs.versions.toml
index 3ec804f..cb082f5 100644
--- a/gradle/libs.versions.toml
+++ b/gradle/libs.versions.toml
@@ -1,5 +1,5 @@
 [versions]
-agp = "8.13.1"
+agp = "8.13.2"
 kotlin = "2.2.21"
 coreKtx = "1.17.0"
 junit = "4.13.2"
diff --git a/query/src/main/java/com/blipblipcode/query/QuerySelect.kt b/query/src/main/java/com/blipblipcode/query/QuerySelect.kt
index 59c98ee..f8455f4 100644
--- a/query/src/main/java/com/blipblipcode/query/QuerySelect.kt
+++ b/query/src/main/java/com/blipblipcode/query/QuerySelect.kt
@@ -17,7 +17,7 @@ import com.blipblipcode.query.operator.SQLOperator
  * @property fields The list of columns to be returned in the result set. Defaults to "*".
  */
 class QuerySelect private constructor(
-    private var where: SQLOperator<*>?,
+    private var where: Pair<String,SQLOperator<*>>?,
     private val table: String,
     private val operations: LinkedHashMap<String, LogicalOperation>,
     private val fields: List<String>
@@ -37,6 +37,21 @@ class QuerySelect private constructor(
             return QueryBuilder(table, LinkedHashMap())
         }
     }
+    /**
+     * Creates a new `QueryBuilder` instance initialized with the current state of this `QuerySelect`.
+     * @param consumer A lambda that receives the `QueryBuilder` to customize the new query.
+     * @return A new `QueryBuilder` instance.
+     */
+    fun newBuilder(consumer:(QueryBuilder)-> Unit): QueryBuilder {
+        val builder = QueryBuilder(table, operations)
+        where?.let { builder.where(it.first, it.second) }
+        builder.setFields(*fields.toTypedArray())
+        orderBy?.let { builder.orderBy(it) }
+        limit?.let { builder.limit(it) }
+        return builder.apply {
+            consumer.invoke(this)
+        }
+    }
 
     /**
      * Removes a logical operation by its key.
@@ -64,7 +79,15 @@ class QuerySelect private constructor(
      * @return The current `QuerySelect` instance for chaining.
      */
     fun setWhere(operator: SQLOperator<*>): QuerySelect {
-        where = operator
+        where = operator.column to operator
+        return this
+    }/**
+     * Sets or replaces the main WHERE clause of the query.
+     * @param operator The new SQL operator for the WHERE clause.
+     * @return The current `QuerySelect` instance for chaining.
+     */
+    fun setWhere(key: String, operator: SQLOperator<*>): QuerySelect {
+        where = key to operator
         return this
     }
 
@@ -100,13 +123,20 @@ class QuerySelect private constructor(
 
     override fun getSqlOperators(): List<SQLOperator<*>> {
         return buildList {
-            where?.let { add(it) }
+            where?.let { add(it.second) }
             operations.values.forEach { add(it.operator) }
             orderBy?.let { add(it) }
             limit?.let { add(it) }
         }
     }
 
+    fun getOperations(): Map<String, SQLOperator<*>> {
+        return buildMap {
+            where?.let { put(it.first, it.second) }
+            operations.forEach { put(it.key, it.value.operator) }
+        }
+    }
+
     override fun getTableName(): String {
         return table
     }
@@ -126,7 +156,7 @@ class QuerySelect private constructor(
             if (where == null) {
                 append("SELECT $fieldStr FROM $table")
             }else{
-                append("SELECT $fieldStr FROM $table WHERE ${where?.toSQLString()} $operationsStr".trim())
+                append("SELECT $fieldStr FROM $table WHERE ${where?.second?.toSQLString()} $operationsStr".trim())
             }
             if (orderBy != null) {
                 append(" ")
@@ -150,7 +180,7 @@ class QuerySelect private constructor(
             if (where == null) {
                 append("SELECT $fieldStr FROM $table")
             }else{
-                append("SELECT $fieldStr FROM $table WHERE ${where?.toSQLString()} $operationsStr".trim())
+                append("SELECT $fieldStr FROM $table WHERE ${where?.second?.toSQLString()} $operationsStr".trim())
             }
             if (orderBy != null) {
                 append(" ")
@@ -211,7 +241,7 @@ class QuerySelect private constructor(
         private val table: String,
         private val operations: LinkedHashMap<String, LogicalOperation>
     ) {
-        private var where: SQLOperator<*>? = null
+        private var where: Pair<String, SQLOperator<*>>? = null
         private var fields: List<String> = listOf("*")
         private var orderBy: OrderBy? = null
         private var limit: Limit? = null
@@ -324,7 +354,17 @@ class QuerySelect private constructor(
          * @return The `QueryBuilder` instance for chaining.
          */
         fun where(operator: SQLOperator<*>): QueryBuilder {
-            where = operator
+            where = operator.column to operator
+            return this
+        }
+
+        /**
+         * Sets the main WHERE clause for the query.
+         * @param operator The SQL operator for the WHERE clause.
+         * @return The `QueryBuilder` instance for chaining.
+         */
+        fun where(key: String, operator: SQLOperator<*>): QueryBuilder {
+            where = key to operator
             return this
         }
 
@@ -376,6 +416,27 @@ class QuerySelect private constructor(
             return this
         }
 
+        /**
+         * Transforms an existing logical operation by its key.
+         * @param key The key of the logical operation to transform.
+         * @param transform A lambda that takes the existing LogicalOperation and returns a new one.
+         * @return The `QueryBuilder` instance for chaining.
+         */
+        fun transformOperation(key:String, transform: (LogicalOperation) -> LogicalOperation): QueryBuilder {
+            when {
+                operations.containsKey(key) -> {
+                    val operator = operations[key]
+                    val newOperations = transform(operator!!)
+                    operations[key] = newOperations
+                }
+                where?.first == key -> {
+                    val newOperations = transform(LogicalOperation(LogicalType.AND, where!!.second))
+                    where = where?.copy(second = newOperations.operator)
+                }
+                else -> Unit
+            }
+            return this
+        }
         /**
          * Builds the `QuerySelect` instance.
          * @return A new `QuerySelect` object.
diff --git a/query/src/main/java/com/blipblipcode/query/UnionQuery.kt b/query/src/main/java/com/blipblipcode/query/UnionQuery.kt
index 6e5bd8e..603f8ee 100644
--- a/query/src/main/java/com/blipblipcode/query/UnionQuery.kt
+++ b/query/src/main/java/com/blipblipcode/query/UnionQuery.kt
@@ -1,5 +1,6 @@
 package com.blipblipcode.query
 
+import com.blipblipcode.query.operator.LogicalOperation
 import com.blipblipcode.query.operator.OrderBy
 import com.blipblipcode.query.operator.SQLOperator
 
@@ -94,21 +95,55 @@ class UnionQuery private constructor(
     fun getOrderBy(): OrderBy? {
         return orderBy
     }
-
+    /**
+     * Creates a new `QueryBuilder` initialized with the current state of this `UnionQuery`.
+     * This allows for further modifications or additions to the existing union query.
+     *
+     * @param consumer A lambda that receives the `QueryBuilder` for further configuration.
+     * @return A new `QueryBuilder` instance initialized with the current queries and union type.
+     */
+    fun newBuilder(consumer:(QueryBuilder)-> Unit): QueryBuilder {
+        val builder = QueryBuilder()
+        builder.addQueries(queries)
+        if(useUnionAll){
+            builder.unionAll()
+        }else{
+            builder.union()
+        }
+        consumer(builder)
+        return builder
+    }
     /**
      * A builder for creating `UnionQuery` instances.
      * This class provides a fluent API to construct a UNION query.
      */
-    class Builder {
+    class QueryBuilder {
         private val queries = mutableListOf<QuerySelect>()
         private var useUnionAll = false
 
+
+        /**
+         * Transforms an existing logical operation by its key.
+         * @param key The key of the logical operation to transform.
+         * @param transform A lambda that takes the existing LogicalOperation and returns a new one.
+         * @return The `QueryBuilder` instance for chaining.
+         */
+        fun transformOperation(key:String, transform: (LogicalOperation) -> LogicalOperation): QueryBuilder {
+            queries.forEachIndexed { index, querySelect ->
+                val newQuery = querySelect.newBuilder { qb ->
+                    qb.transformOperation(key, transform)
+                }.build()
+                queries[index] = newQuery
+            }
+            return this
+        }
+
         /**
          * Adds a query to the union.
          * @param query The `QuerySelect` to add.
          * @return The `Builder` instance for chaining.
          */
-        fun addQuery(query: QuerySelect): Builder {
+        fun addQuery(query: QuerySelect): QueryBuilder {
             queries.add(query)
             return this
         }
@@ -118,7 +153,7 @@ class UnionQuery private constructor(
          * @param queries The list of `QuerySelect` objects to add.
          * @return The `Builder` instance for chaining.
          */
-        fun addQueries(queries: List<QuerySelect>): Builder {
+        fun addQueries(queries: List<QuerySelect>): QueryBuilder {
             this.queries.addAll(queries)
             return this
         }
@@ -127,7 +162,7 @@ class UnionQuery private constructor(
          * Sets the union type to UNION ALL.
          * @return The `Builder` instance for chaining.
          */
-        fun unionAll(): Builder {
+        fun unionAll(): QueryBuilder {
             useUnionAll = true
             return this
         }
@@ -136,7 +171,7 @@ class UnionQuery private constructor(
          * Sets the union type to UNION (default).
          * @return The `Builder` instance for chaining.
          */
-        fun union(): Builder {
+        fun union(): QueryBuilder {
             useUnionAll = false
             return this
         }
@@ -158,8 +193,8 @@ class UnionQuery private constructor(
          * @param baseQuery The first `QuerySelect` in the union.
          * @return A new `Builder` instance.
          */
-        fun builder(baseQuery: QuerySelect): Builder {
-            return Builder().also { builder ->
+        fun builder(baseQuery: QuerySelect): QueryBuilder {
+            return QueryBuilder().also { builder ->
                 builder.addQuery(baseQuery)
             }
         }
@@ -169,10 +204,29 @@ class UnionQuery private constructor(
          * @param baseQuery The first `QuerySelect` in the union.
          * @return A new `Builder` instance configured for UNION ALL.
          */
-        fun builderAll(baseQuery: QuerySelect): Builder {
-            return Builder().also { builder ->
+        fun builderAll(baseQuery: QuerySelect): QueryBuilder {
+            return QueryBuilder().also { builder ->
                 builder.addQuery(baseQuery).unionAll()
             }
         }
     }
 }
+fun main() {
+    // Example usage:
+    val query1 = QuerySelect.builder("users")
+        .where(SQLOperator.Equals("age", 30))
+        .and(SQLOperator.Equals("id", 30)).orderBy(
+        OrderBy.Asc("name")).build()
+    val query2 = QuerySelect.builder("admins")
+        .where(SQLOperator.Equals("edad", 30))
+        .and(SQLOperator.Equals("ege", 30))
+        .limit(10)
+        .orderBy(OrderBy.Desc("id")).build()
+
+    val unionQuery = UnionQuery.builder(query1)
+        .addQuery(query2)
+        .unionAll()
+        .build()
+
+    println(unionQuery.asSql())
+}
\ No newline at end of file
diff --git a/query/src/main/java/com/blipblipcode/query/operator/SQLOperator.kt b/query/src/main/java/com/blipblipcode/query/operator/SQLOperator.kt
index b4c4368..6896c22 100644
--- a/query/src/main/java/com/blipblipcode/query/operator/SQLOperator.kt
+++ b/query/src/main/java/com/blipblipcode/query/operator/SQLOperator.kt
@@ -152,8 +152,8 @@ sealed interface SQLOperator<T> {
         override fun toSQLString(): String {
             val startStr = caseConversion.asSqlFunction(start.toString())
             val endStr = caseConversion.asSqlFunction(end.toString())
-            return "${caseConversion.asSqlFunction(column)} $symbol $startStr AND $endStr"
+            return "${caseConversion.asSqlFunction(column)} $symbol '$startStr' AND '$endStr'"
         }
-        override fun asString(): String = "${caseConversion.asSqlFunction(column)} $symbol ${caseConversion.asSqlFunction(start.toString())} AND ${caseConversion.asSqlFunction(start.toString())}"
+        override fun asString(): String = "${caseConversion.asSqlFunction(column)} $symbol '${caseConversion.asSqlFunction(start.toString())}' AND '${caseConversion.asSqlFunction(start.toString())}'"
     }
 }
diff --git a/query/src/main/java/com/blipblipcode/query/utils/Extensions.kt b/query/src/main/java/com/blipblipcode/query/utils/Extensions.kt
index f01b7b7..b8a1aac 100644
--- a/query/src/main/java/com/blipblipcode/query/utils/Extensions.kt
+++ b/query/src/main/java/com/blipblipcode/query/utils/Extensions.kt
@@ -81,7 +81,7 @@ fun QuerySelect.unionAll(other: QuerySelect): UnionQuery {
  * @return A new `UnionQuery` instance containing the new query.
  */
 fun UnionQuery.addQuery(query: QuerySelect): UnionQuery {
-    return UnionQuery.Builder()
+    return UnionQuery.QueryBuilder()
         .addQueries(this.queries)
         .addQuery(query)
         .apply { if (this@addQuery.useUnionAll) unionAll() else union() }