4.1 Create Database play 4.2 Data Table Operations (I) play 4.3 Data Table Operations (II) play 5.1 Data Update（I）play 5.1Data Update（II）play 5.2 Single- Table Query (I) play 5.2 Single- Table Query (II) play 5.2 Join Queries play 5.2 Nested Queries play 6.1 Viewing and Deleting View play 6.1Creating Views play 6.1 Updating Views play 6.2 Index Operations play 6.2 Concept of Indexes play 6.3 Cursors play 7.1 Variables play 7.2 User-Defined Functions play 7.3 Viewing, Executing, Modifying, and Deleting Stored Procedures play 7.3Creating Stored Procedures play 7.4 Trigger Activation and Deletion play 7.4 Creating and Viewing Triggers play 7.Transactions play 7.Transaction Isolation Levels play 7.Non-Repeatable Read play 7.Phantom Read and Serializability play 7 Dirty Read play 8.2 Creating Users play 8.2Modifying and Deleting Users play 8.3 Privilege Management play 8.4 Data Backup and Restoration play