Database operation of tyut Taiyuan University of technology 2022 database

Question 3

Database operations include 2 Type of question ：

The first is to give several groups of relational patterns without data , Perform database operations on it .eg： example 1

The second is to give some structural tables with data , Perform data operations on it .eg： example 2

The examination sites are all chapter four , It's best to summarize all kinds of SQL sentence , Strengthen the memory

Required form ：

example 1、

Staff - The union database has three basic tables ：

workers （ Employee number , name , Set up the time , Gender ）;

Labour Union （ Number , name , Person in charge: employee No , Place of activity ）;

To participate in （ Employee number , Number , Date of participation ）.

The primary key of the employee table is the employee number , The primary key of the union table is number , The primary key of the participating table is the employee number and number . The trial SQL Statement does the following ：

（1） Define employee table , Including employee No 、 name 、 The gender is character type , The establishment time is integer , The employee number is the primary key ;

（2） The employee number of the person in charge of inquiry is “001” Number and name of the member ;

（3） Check the information of the female employee surnamed Zhang ;

（4） Increase the establishment time of Li Si in the employee list 1.

（5） The query was established on 20 To the age of 30 Employee number of employees between years old 、 Name and date of establishment , And add the establishment time 1 Output ;

（6） The number of the trade union participating in the inquiry is “T1” Employee number .

Explain ：

example 2、

In a warehouse management system , There are two tables. ：KC Table saves the information and... Of the materials in the current warehouse CKMX Table storage stock           Issue details of materials ,

          Its structure is as follows ：

KC（ Material code , Material name , Company , The unit price , Inventory quantity ） The material code is the primary key ;

CKMX（ Delivery order No , Material code , Delivery date , Delivery quantity ） The delivery order is the primary key , Material code is foreign key .

1. Try to create KC Table and CKMX Tabular SQL sentence , Entity definition and referential integrity are required .
2. use SQL The command will be as follows 4-3 And table 4-4 The data of are inserted into KC Table and CKMX In the table .
3. Inquire about the number of the computer 、 Delivery date 、 Material name 、 The unit price 、 Delivery information of delivery quantity and amount .
4. From the table CKMX Count the delivery times and total delivery quantity of various materials , Try to write SQL sentence .

surface 4-3、KC Table structure and data

Material code	Material name	Company	The unit price	Inventory quantity
01	Computer	platform	5000.00	10
02	The TV	platform	2000.00	20

surface 4-4、CKMX Table structure and data

Delivery order No	Material code	Delivery date	Delivery quantity
1	01	2020-10-10	4
2	01	2020-11-20	3
3	02	2020-11-20	5

Explain ：

Add ： There is a thing called wildcard ：a%b Said to a start b Any length string at the end eg：akdhb

            use BETWEEN Means to contain eg：20< Time <50 It's written in SQL Have to write Time BETWEEN 20  AND 50

          When the teacher draws the key points , Just say that the fourth chapter will come out SQL Language problems （ In previous years ）, So there is no summary view here 、 Indexed SQL Sentence notes , Just recite the summary at the beginning of my article , Do a few more examples , The exam is completely enough