diff --git a/nur_src/m/base/Query.php b/nur_src/m/base/Query.php
index 0fcad82..596cd38 100644
--- a/nur_src/m/base/Query.php
+++ b/nur_src/m/base/Query.php
@@ -111,7 +111,7 @@ abstract class Query implements IQuery {
   /** @var string requête SQL de sélection par défaut */
   const SQL_SELECT = null;
 
-  function select(?string $sql=null, ?array $filter=null): IQuery {
+  function select($sql=null, ?array $filter=null): IQuery {
     if ($sql === null) $sql = static::SQL_SELECT;
     $this->type = self::TYPE_SELECT;
     $this->sql = $sql;
@@ -125,7 +125,7 @@ abstract class Query implements IQuery {
   /** @var string requête SQL de mise à jour par défaut */
   const SQL_UPDATE = null;
 
-  function update(?string $sql=null, ?array $filter=null, $row=null, ?array &$results=null): IQuery {
+  function update($sql=null, ?array $filter=null, $row=null, ?array &$results=null): IQuery {
     if ($sql === null) $sql = static::SQL_UPDATE;
     $this->type = self::TYPE_UPDATE;
     $this->sql = $sql;
@@ -138,7 +138,7 @@ abstract class Query implements IQuery {
   /** @var string requête SQL d'insertion par défaut */
   const SQL_INSERT = null;
 
-  function insert(?string $sql=null, $row=null, ?array &$results=null): IQuery {
+  function insert($sql=null, $row=null, ?array &$results=null): IQuery {
     if ($sql === null) $sql = static::SQL_INSERT;
     $this->type = self::TYPE_INSERT;
     $this->sql = $sql;
diff --git a/nur_src/m/pdo/PdoQuery.php b/nur_src/m/pdo/PdoQuery.php
index 5f2a4eb..64a5fc1 100644
--- a/nur_src/m/pdo/PdoQuery.php
+++ b/nur_src/m/pdo/PdoQuery.php
@@ -20,7 +20,7 @@ class PdoQuery extends Query {
     return new PdoRowIterator($this->conn, $sql, $bindings, $incarnation);
   }
 
-  function __construct(PdoConn $conn, ?string $sql=null, ?array $filter=null, ?IRowIncarnation $incarnation=null) {
+  function __construct(PdoConn $conn, $sql=null, ?array $filter=null, ?IRowIncarnation $incarnation=null) {
     $this->conn = $conn;
     if ($incarnation === null) $incarnation = $this->newRowIncarnation();
     $this->setIncarnation($incarnation);
diff --git a/nur_src/m/pdo/mysql/MysqlConn.php b/nur_src/m/pdo/mysql/MysqlConn.php
index fe63228..7c24c87 100644
--- a/nur_src/m/pdo/mysql/MysqlConn.php
+++ b/nur_src/m/pdo/mysql/MysqlConn.php
@@ -8,7 +8,7 @@ use nur\m\pdo\PdoConn;
 class MysqlConn extends PdoConn {
   const HAVE_LAST_INSERT_ID = true;
 
-  function query(?string $sql=null, ?array $filter=null, ?IRowIncarnation $incarnation=null): IQuery {
+  function query($sql=null, ?array $filter=null, ?IRowIncarnation $incarnation=null): IQuery {
     return new MysqlQuery($this, $sql, $filter, $incarnation);
   }
 }
diff --git a/nur_src/m/pdo/mysql/MysqlQuery.php b/nur_src/m/pdo/mysql/MysqlQuery.php
index ee8b611..407660c 100644
--- a/nur_src/m/pdo/mysql/MysqlQuery.php
+++ b/nur_src/m/pdo/mysql/MysqlQuery.php
@@ -1,11 +1,28 @@
 <?php
 namespace nur\m\pdo\mysql;
 
+use nur\m\IQuery;
 use nur\m\IRowIncarnation;
 use nur\m\pdo\PdoQuery;
+use nur\sery\db\mysql\query;
 
 class MysqlQuery extends PdoQuery {
   protected function newRowIncarnation(): IRowIncarnation {
     return new MysqlRowIncarnation();
   }
+
+  function select($sql=null, ?array $filter=null): IQuery {
+    if (is_array($sql)) [$sql, $filter] = query::with($sql, $filter);
+    return parent::select($sql, $filter);
+  }
+
+  function update($sql=null, ?array $filter=null, $row=null, ?array &$results=null): IQuery {
+    if (is_array($sql)) [$sql, $filter] = query::with($sql, $filter);
+    return parent::update($sql, $filter, $row, $results);
+  }
+
+  function insert($sql=null, $row=null, ?array &$results=null): IQuery {
+    if (is_array($sql)) [$sql, $row] = query::with($sql, $row);
+    return parent::insert($sql, $row, $results);
+  }
 }
diff --git a/src/cl.php b/src/cl.php
index 316f016..9a6e716 100644
--- a/src/cl.php
+++ b/src/cl.php
@@ -134,25 +134,50 @@ class cl {
 
   /**
    * retourner un tableau construit à partir des clés de $keys
-   * - [$key => $skey] --> $dest[$key] = self::get($array, $skey)
-   * - [$key => null]  --> $dest[$key] = null
-   * - [$key]          --> $dest[$key] = self::get($array, $key)
+   * - [$to => $from]  --> $dest[$to] = self::get($array, $from)
+   * - [$to => null]   --> $dest[$to] = null
+   * - [$to]           --> $dest[$to] = self::get($array, $to)
    * - [null]          --> NOP
+   *
+   * Si $inverse===true, le mapping est inversé:
+   * - [$to => $from]  --> $dest[$from] = self::get($array, $to)
+   * - [$to => null]   --> $dest[$to] = self::get($array, $to)
+   * - [$to]           --> $dest[$to] = self::get($array, $to)
+   * - [null]          --> NOP
+   *
+   * notez que l'ordre est inversé par rapport à {@link self::rekey()} qui
+   * attend des mappings [$from => $to], alors que cette méthode attend des
+   * mappings [$to => $from]
    */
-  static final function select($array, ?array $keys): array {
+  static final function select($array, ?array $mappings, bool $inverse=false): array {
     $selected = [];
     $index = 0;
-    foreach ($keys as $key => $skey) {
-      if ($key === $index) {
-        $index++;
-        if ($skey === null) continue;
-        $value = self::get($array, $skey);
-        $key = $skey;
-      } else {
-        if ($skey === null) $value = null;
-        else $value = self::pget($array, $skey);
+    if ($inverse) {
+      foreach ($mappings as $to => $from) {
+        if ($to === $index) {
+          $index++;
+          $to = $from;
+          if ($to === null) continue;
+          $selected[$to] = self::get($array, $to);
+        } elseif ($from === null) {
+          $selected[$to] = self::pget($array, $to);
+        } else {
+          $selected[$from] = self::pget($array, $to);
+        }
+      }
+    } else {
+      foreach ($mappings as $to => $from) {
+        if ($to === $index) {
+          $index++;
+          if ($from === null) continue;
+          $value = self::get($array, $from);
+          $to = $from;
+        } else {
+          if ($from === null) $value = null;
+          else $value = self::pget($array, $from);
+        }
+        $selected[$to] = $value;
       }
-      $selected[$key] = $value;
     }
     return $selected;
   }
@@ -451,9 +476,12 @@ class cl {
   /**
    * retourner le tableau $array en "renommant" les clés selon le tableau
    * $mappings qui contient des associations de la forme [$from => $to]
+   *
+   * Si $inverse===true, renommer dans le sens $to => $from
    */
-  static function rekey(?array $array, ?array $mappings): ?array {
+  static function rekey(?array $array, ?array $mappings, bool $inverse=false): ?array {
     if ($array === null || $mappings === null) return $array;
+    if ($inverse) $mappings = array_flip($mappings);
     $mapped = [];
     foreach ($array as $key => $value) {
       if (array_key_exists($key, $mappings)) $key = $mappings[$key];