Update mariadb.md

docs/progs/mariadb.md

@@ -6,3 +6,15 @@
 CREATE DATABASE dbn CHARACTER SET utf8 COLLATE utf8_general_ci;
 CREATE USER 'usr'@'localhost' IDENTIFIED BY 'pwd'; GRANT ALL PRIVILEGES ON dbn.* TO usr@localhost;
 ```
+
+## Create dump by table
+```bash
+for tab in `echo "SHOW TABLES" | mysql dbName | grep -v Tables_in_`; do
+	mysqldump --extended-insert=FALSE dbName "$tab" > "dbName-$tab-`date +%Y-%m-%d`.sql"
+done
+```
+
+## Append field in table
+```sql
+ALTER TABLE existsTableName ADD COLUMN `newFieldName` varchar(64) NOT NULL DEFAULT '';
+```