created two migrations for table_a and table_b

console/controllers/FillTableAController.php

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+<?
+
+namespace console\controllers;
+
+use yii;
+use yii\console\Controller;
+use yii\helpers\Console;
+use yii\base\Security;
+
+class FillTableAController extends Controller
+{
+    //Records count to generate
+    private $records_count = 1000;
+
+    /**
+     * Run command: yii fill-table-a
+     * @return int
+     * @throws yii\base\Exception
+     * @throws yii\db\Exception
+     */
+    public function actionIndex()
+    {
+        $security = new Security();
+
+        Console::startProgress(0,$this->records_count);
+        for( $i=0;$i<$this->records_count;$i++ ) {
+            Yii::$app->db->createCommand()->insert('table_a',['value'=>$security->generateRandomString(8)])->execute();
+            Console::updateProgress($i,$this->records_count);
+        }
+        Console::endProgress('done'.PHP_EOL);
+
+        return 0;
+    }
+}

console/controllers/MoveDataController.php

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+<?php
+
+namespace console\controllers;
+
+use yii;
+use yii\console\Controller;
+use yii\helpers\Console;
+
+class MoveDataController extends Controller
+{
+    /**
+     * Run command: yii move-data
+     * @return int
+     * @throws yii\db\Exception
+     */
+    public function actionIndex()
+    {
+        $data_a = Yii::$app->db->createCommand('SELECT * FROM table_a')->queryAll();
+
+        Yii::$app->db->createCommand()->batchInsert('table_b',['id','value'],$data_a)->execute();
+
+        return 0;
+    }
+}

console/migrations/m190516_082608_create_table_a.php

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+<?php
+
+use yii\db\Migration;
+
+/**
+ * Class m190516_082608_create_table_a
+ */
+class m190516_082608_create_table_a extends Migration
+{
+    public function safeUp()
+    {
+        $this->createTable(
+            'table_a',
+            [
+                'id' => $this->primaryKey(),
+                'value' => $this->string(),
+            ]
+        );
+    }
+
+    public function safeDown()
+    {
+        $this->dropTable('table_a');
+    }
+}

console/migrations/m190516_090632_create_table_b.php

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+<?php
+
+use yii\db\Migration;
+
+/**
+ * Class m190516_090632_create_table_b
+ */
+class m190516_090632_create_table_b extends Migration
+{
+    public function safeUp()
+    {
+        $this->createTable(
+            'table_b',
+            [
+                'id' => $this->primaryKey(),
+                'value' => $this->string(),
+            ]
+        );
+    }
+
+    public function safeDown()
+    {
+        $this->dropTable('table_b');
+    }
+}