more sql-migrations

Author: asmyasnikov

database/ydb/examples/migrations/003_create_topic.down.sql

@@ -1 +1 @@
-DROP TOPIC `test/topic`;
+DROP TOPIC IF EXISTS `test/topic`;

database/ydb/examples/migrations/004_add_index_on_user_emails.down.sql

@@ -0,0 +1 @@
+ALTER TABLE `test/users` DROP INDEX `users_email_index`;

database/ydb/examples/migrations/004_add_index_on_user_emails.up.sql

@@ -0,0 +1 @@
+ALTER TABLE `test/users` ADD INDEX `users_email_index` GLOBAL UNIQUE ON (`email`);

database/ydb/examples/migrations/005_create_books_table.down.sql

@@ -0,0 +1 @@
+DROP TABLE IF EXISTS `test/books`;

database/ydb/examples/migrations/005_create_books_table.up.sql

@@ -0,0 +1,6 @@
+CREATE TABLE `test/books` (
+  user_id Uint64,
+  name    Text,
+  author  Text,
+  PRIMARY KEY (user_id)
+);

database/ydb/examples/migrations/006_create_movies_table.down.sql

@@ -0,0 +1 @@
+DROP TABLE IF EXISTS `test/movies`;

database/ydb/examples/migrations/006_create_movies_table.up.sql

@@ -0,0 +1,6 @@
+CREATE TABLE `test/movies` (
+  user_id   Uint64,
+  name      Text,
+  director  Text,
+  PRIMARY KEY (user_id)
+);