Examples

Some examples from extension styleguide to get an idea on what the field definition is capable of: An input field with slider, a select drop-down for images, an inline relation spanning multiple tables.

The following examples all can be found in the extension styleguide.

Select drop-down for records represented by images

Select field with foreign table relation and field wizard:

EXT:styleguide/Configuration/TCA/tx_styleguide_elements_select.php 
[
    'columns' => [
        'select_single_12' => [
            'exclude' => 1,
            'label' => 'select_single_12 foreign_table selicon_field',
            'config' => [
                'type' => 'select',
                'renderType' => 'selectSingle',
                'foreign_table' => 'tx_styleguide_elements_select_single_12_foreign',
                'fieldWizard' => [
                    'selectIcons' => [
                        'disabled' => false,
                    ],
                ],
            ],
        ],
    ],
]
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The table tx_styleguide_elements_select_single_12_foreign is defined as follows:

[
   'ctrl' => [
      'title' => 'Form engine elements - select foreign single_12',
      'label' => 'fal_1',
      'selicon_field' => 'fal_1',
      // ...
   ],

   'columns' => [
      // ...
      'fal_1' => [
         'label' => 'fal_1 selicon_field',
         'config' => \TYPO3\CMS\Core\Utility\ExtensionManagementUtility::getFileFieldTCAConfig(
            'fal_1',
            [
               'maxitems' => 1,
            ],
            $GLOBALS['TYPO3_CONF_VARS']['SYS']['mediafile_ext']
         ),
      ],
   ],
   // ...

];
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Inline relation (IRRE) spanning multiple tables

Inline relation to a foreign table:

EXT:styleguide/Configuration/TCA/tx_styleguide_inline_1n1n.php 
[
    'columns' => [
        'inline_1' => [
            'exclude' => 1,
            'label' => 'inline_1',
            'config' => [
                'type' => 'inline',
                'foreign_table' => 'tx_styleguide_inline_1n1n_child',
                'foreign_field' => 'parentid',
                'foreign_table_field' => 'parenttable',
            ],
        ],
    ],
]
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