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Key Difference – DDL vs DML A database is used to store data. There are various types of databases. One common database type is Relational Databases. In these databases, data is stored in tables. Tables consist of rows and columns. A row is a record, and a column is a field. The tables are […]
触发器和铜rsors In a database, a trigger is a procedure (code segment) that is executed automatically when some specific events occur in a table/view. Among its other uses, triggers are mainly used for maintaining integrity in a database. A cursor is a control structure used in databases to go through the database records. It […]
更新vs Alter Update and Alter are two SQL (Structured Query Language) commands used for modifying databases. Update statement is used to update existing records in a database. Update is a Data Manipulation Language (DML) statement. Alter SQL command is used to modify, delete or add a column to an existing table in a database. […]
