diff --git a/CHANGELOG.md b/CHANGELOG.md
index e413b33..e057607 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -13,9 +13,9 @@
 - Enh #277: Raise minimum PHP version to `^8.1` with minor refactoring (@Tigrov)
 - New #276, #288: Implement `ColumnFactory` class (@Tigrov)
 - Enh #279: Separate column type constants (@Tigrov)
-- New #280: Realize `ColumnBuilder` class (@Tigrov)
+- New #280, #291: Realize `ColumnBuilder` class (@Tigrov)
 - Enh #281: Update according changes in `ColumnSchemaInterface` (@Tigrov)
-- New #282: Add `ColumnDefinitionBuilder` class (@Tigrov)
+- New #282, #291: Add `ColumnDefinitionBuilder` class (@Tigrov)
 - Bug #285: Fix `DMLQueryBuilder::insertBatch()` method (@Tigrov)
 - Enh #283: Refactor `Dsn` class (@Tigrov)
 - Enh #286: Use constructor to create columns and initialize properties (@Tigrov)
diff --git a/src/Column/ColumnBuilder.php b/src/Column/ColumnBuilder.php
index 41e9457..0e5f26b 100644
--- a/src/Column/ColumnBuilder.php
+++ b/src/Column/ColumnBuilder.php
@@ -9,26 +9,6 @@
 
 final class ColumnBuilder extends \Yiisoft\Db\Schema\Column\ColumnBuilder
 {
-    public static function tinyint(int|null $size = 3): ColumnSchemaInterface
-    {
-        return parent::tinyint($size);
-    }
-
-    public static function smallint(int|null $size = 5): ColumnSchemaInterface
-    {
-        return parent::smallint($size);
-    }
-
-    public static function integer(int|null $size = 10): ColumnSchemaInterface
-    {
-        return parent::integer($size);
-    }
-
-    public static function bigint(int|null $size = 20): ColumnSchemaInterface
-    {
-        return parent::bigint($size);
-    }
-
     public static function binary(int|null $size = null): ColumnSchemaInterface
     {
         return new BinaryColumnSchema(ColumnType::BINARY, size: $size);
diff --git a/src/Column/ColumnDefinitionBuilder.php b/src/Column/ColumnDefinitionBuilder.php
index baad503..10c5eb1 100644
--- a/src/Column/ColumnDefinitionBuilder.php
+++ b/src/Column/ColumnDefinitionBuilder.php
@@ -19,6 +19,10 @@ final class ColumnDefinitionBuilder extends AbstractColumnDefinitionBuilder
     protected const GENERATE_UUID_EXPRESSION = 'sys_guid()';
 
     protected const TYPES_WITH_SIZE = [
+        'char',
+        'nchar',
+        'character',
+        'varchar',
         'varchar2',
         'nvarchar2',
         'number',
@@ -27,8 +31,6 @@ final class ColumnDefinitionBuilder extends AbstractColumnDefinitionBuilder
         'interval day(0) to second',
         'raw',
         'urowid',
-        'char',
-        'nchar',
     ];
 
     protected const TYPES_WITH_SCALE = [
@@ -67,7 +69,7 @@ protected function getDbType(ColumnSchemaInterface $column): string
         $size = $column->getSize();
 
         /** @psalm-suppress DocblockTypeContradiction */
-        return match ($column->getType()) {
+        return $column->getDbType() ?? match ($column->getType()) {
             ColumnType::BOOLEAN => 'number(1)',
             ColumnType::BIT => match (true) {
                 $size === null => 'number(38)',
@@ -83,7 +85,7 @@ protected function getDbType(ColumnSchemaInterface $column): string
             ColumnType::DECIMAL => 'number(' . ($size ?? 10) . ',' . ($column->getScale() ?? 0) . ')',
             ColumnType::MONEY => 'number(' . ($size ?? 19) . ',' . ($column->getScale() ?? 4) . ')',
             ColumnType::CHAR => 'char',
-            ColumnType::STRING => 'varchar2',
+            ColumnType::STRING => 'varchar2(' . ($size ?? 255) . ')',
             ColumnType::TEXT => 'clob',
             ColumnType::BINARY => 'blob',
             ColumnType::UUID => 'raw(16)',
@@ -91,9 +93,9 @@ protected function getDbType(ColumnSchemaInterface $column): string
             ColumnType::TIMESTAMP => 'timestamp',
             ColumnType::DATE => 'date',
             ColumnType::TIME => 'interval day(0) to second',
-            ColumnType::ARRAY => 'json',
-            ColumnType::STRUCTURED => 'json',
-            ColumnType::JSON => 'json',
+            ColumnType::ARRAY => 'clob',
+            ColumnType::STRUCTURED => 'clob',
+            ColumnType::JSON => 'clob',
             default => 'varchar2',
         };
     }
diff --git a/src/Column/ColumnFactory.php b/src/Column/ColumnFactory.php
index c3d9c2b..1411493 100644
--- a/src/Column/ColumnFactory.php
+++ b/src/Column/ColumnFactory.php
@@ -25,6 +25,8 @@ final class ColumnFactory extends AbstractColumnFactory
     protected const TYPE_MAP = [
         'char' => ColumnType::CHAR,
         'nchar' => ColumnType::CHAR,
+        'character' => ColumnType::CHAR,
+        'varchar' => ColumnType::STRING,
         'varchar2' => ColumnType::STRING,
         'nvarchar2' => ColumnType::STRING,
         'clob' => ColumnType::TEXT,
diff --git a/tests/Provider/ColumnBuilderProvider.php b/tests/Provider/ColumnBuilderProvider.php
index 41bbb5e..a846cde 100644
--- a/tests/Provider/ColumnBuilderProvider.php
+++ b/tests/Provider/ColumnBuilderProvider.php
@@ -12,16 +12,6 @@ public static function buildingMethods(): array
     {
         $values = parent::buildingMethods();
 
-        $values['primaryKey()'][4]['getSize'] = 10;
-        $values['primaryKey(false)'][4]['getSize'] = 10;
-        $values['smallPrimaryKey()'][4]['getSize'] = 5;
-        $values['smallPrimaryKey(false)'][4]['getSize'] = 5;
-        $values['bigPrimaryKey()'][4]['getSize'] = 20;
-        $values['bigPrimaryKey(false)'][4]['getSize'] = 20;
-        $values['tinyint()'][4]['getSize'] = 3;
-        $values['smallint()'][4]['getSize'] = 5;
-        $values['integer()'][4]['getSize'] = 10;
-        $values['bigint()'][4]['getSize'] = 20;
         $values['binary()'][2] = BinaryColumnSchema::class;
         $values['binary(8)'][2] = BinaryColumnSchema::class;
 
diff --git a/tests/Provider/QueryBuilderProvider.php b/tests/Provider/QueryBuilderProvider.php
index 5f8b8ec..95da6dc 100644
--- a/tests/Provider/QueryBuilderProvider.php
+++ b/tests/Provider/QueryBuilderProvider.php
@@ -248,7 +248,7 @@ public static function buildColumnDefinition(): array
         $values[PseudoType::UBIGPK][0] = 'number(20) GENERATED BY DEFAULT AS IDENTITY PRIMARY KEY';
         $values[PseudoType::UUID_PK][0] = 'raw(16) DEFAULT sys_guid() PRIMARY KEY';
         $values[PseudoType::UUID_PK_SEQ][0] = 'raw(16) DEFAULT sys_guid() PRIMARY KEY';
-        $values['STRING'][0] = 'varchar2';
+        $values['STRING'][0] = 'varchar2(255)';
         $values['STRING(100)'][0] = 'varchar2(100)';
         $values['primaryKey()'][0] = 'number(10) GENERATED BY DEFAULT AS IDENTITY PRIMARY KEY';
         $values['primaryKey(false)'][0] = 'number(10) PRIMARY KEY';
@@ -263,7 +263,7 @@ public static function buildColumnDefinition(): array
         $values['bit()'][0] = 'number(38)';
         $values['bit(1)'][0] = 'number(1)';
         $values['bit(8)'][0] = 'number(3)';
-        $values['bit(1000)'][0] = 'raw(125)';
+        $values['bit(64)'][0] = 'number(20)';
         $values['tinyint()'][0] = 'number(3)';
         $values['tinyint(2)'][0] = 'number(2)';
         $values['smallint()'][0] = 'number(5)';
@@ -288,7 +288,7 @@ public static function buildColumnDefinition(): array
         $values['money(null)'][0] = 'number(19,4)';
         $values['string()'][0] = 'varchar2(255)';
         $values['string(100)'][0] = 'varchar2(100)';
-        $values['string(null)'][0] = 'varchar2';
+        $values['string(null)'][0] = 'varchar2(255)';
         $values['text()'][0] = 'clob';
         $values['text(1000)'][0] = 'clob';
         $values['binary()'][0] = 'blob';
@@ -300,18 +300,23 @@ public static function buildColumnDefinition(): array
         $values['time()'][0] = 'interval day(0) to second(0)';
         $values['time(6)'][0] = 'interval day(0) to second(6)';
         $values['time(null)'][0] = 'interval day(0) to second';
+        $values['array()'][0] = 'clob';
+        $values['structured()'][0] = 'clob';
+        $values["structured('json')"] = ['blob', ColumnBuilder::structured('blob')];
+        $values['json()'][0] = 'clob';
+        $values['json(100)'][0] = 'clob';
+        $values["extra('NOT NULL')"][0] = 'varchar2(255) NOT NULL';
+        $values["extra('')"][0] = 'varchar2(255)';
+        $values["check('value > 5')"][0] = 'number(10) CHECK ("col_59" > 5)';
+        $values["check('')"][0] = 'number(10)';
+        $values['check(null)'][0] = 'number(10)';
         $values["comment('comment')"][0] = 'varchar2(255)';
         $values["comment('')"][0] = 'varchar2(255)';
         $values['comment(null)'][0] = 'varchar2(255)';
-        $values["extra('bar')"][0] = 'varchar2(255) bar';
-        $values["extra('')"][0] = 'varchar2(255)';
-        $values["check('value > 5')"][0] = 'varchar2(255) CHECK (value > 5)';
-        $values["check('')"][0] = 'varchar2(255)';
-        $values['check(null)'][0] = 'varchar2(255)';
         $values["defaultValue('value')"][0] = "varchar2(255) DEFAULT 'value'";
         $values["defaultValue('')"][0] = "varchar2(255) DEFAULT ''";
         $values['defaultValue(null)'][0] = 'varchar2(255) DEFAULT NULL';
-        $values['defaultValue($expression)'][0] = 'varchar2(255) DEFAULT expression';
+        $values['defaultValue($expression)'][0] = 'number(10) DEFAULT (1 + 2)';
         $values['notNull()->defaultValue(null)'][0] = 'varchar2(255) NOT NULL';
         $values['notNull()'][0] = 'varchar2(255) NOT NULL';
         $values['null()'][0] = 'varchar2(255) NULL';