Sql constraints - PowerPoint PPT Presentation

SQL DDL

SQL DDL. -Software School of Hunan University- 2006.09. SQL DDL Overview. SQL contains a data definition language (DDL) that allows users to: add, modify, and drop tables create views define and enforce integrity constraints enforce security restrict. SQL Identifiers.

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Chapter # 7 Introduction to Structured Query Language (SQL)

Chapter # 7 Introduction to Structured Query Language (SQL). Part I. SQL functions fit into two broad categories: Data definition language Data manipulation language Basic command set has vocabulary of less than 100 words

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Database Systems I SQL Constraints and Triggers

Database Systems I SQL Constraints and Triggers. Integrity Constraints. An integrity constraint (IC) describes conditions that every legal instance of a relation must satisfy. Inserts/deletes/updates that violate IC’s are disallowed.

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