Database - Chapter 3 standard relational database language SQL-3.4 data update

Data Update

First, insert data

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1. Insert a tuple

Statement format :

Function :

Example :

2. Insert the sub-query results

Statement format :

Example :

Second, modify data

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1. statement format

2. Functions

3. Modify the way

Modifying the values of one tuple :

Modify the value of the plurality of tuples :

Tape modify the query statement :

Third, delete data

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1. statement format

2. Functions

3. Delete way

Delete the value of one tuple :

Delete multiple value tuples :

Delete statement strap query :

"Introduction to Data System (fifth edition)" - - Reference Renmin University - Wang Shan