magento2-remove-category.sql

```
SET FOREIGN_KEY_CHECKS = 0;
TRUNCATE TABLE `catalog_category_entity`;
TRUNCATE TABLE `catalog_category_entity_datetime`;
TRUNCATE TABLE `catalog_category_entity_decimal`;
TRUNCATE TABLE `catalog_category_entity_int`;
TRUNCATE TABLE `catalog_category_entity_text`;
TRUNCATE TABLE `catalog_category_entity_varchar`;
TRUNCATE TABLE `catalog_category_product`;
TRUNCATE TABLE `catalog_category_product_index`;
TRUNCATE TABLE `catalog_category_product_index_tmp`;
INSERT INTO `catalog_category_entity` (`entity_id`, `attribute_set_id`, `parent_id`, `created_at`, `updated_at`, `path`, `position`, `level`, `children_count`) VALUES (1, 0, 0, '2016-10-10 10:10:50', '2016-10-10 10:10:50', '1', 0, 0, 1);
SET FOREIGN_KEY_CHECKS = 1;
```

ALTER TABLE catalog_category_entity AUTO_INCREMENT = 1;