结构化查询语言(Structured Query Language)简称SQL，结构化查询语言是一种数据库查询和程序设计语言，用于存取数据以及查询、更新和管理关系数据库系统；
sql 语句就是对数据库进行操作的一种语言。
常见语句
更新：update table1 set field1=value1 where 范围
查找：select * from table1 where field1 like ’%value1%’ （所有包含‘value1’这个模式的字符串）
排序：select * from table1 order by field1,field2 [desc]
求和：select sum(field1) as sumvalue from table1
平均：select avg(field1) as avgvalue from table1
最大：select max(field1) as maxvalue from table1
最小：select min(field1) as minvalue from table1[separator]
2022-05-18 00:49:41
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资源包括：19道SQL语句查询题目及答案、建表SQL语句、题目相关的表截图。答案中除了包含intersect、except关键词的答案，其余都在MySQL上跑过，确保运行无误（MySQL不支持intersect、except关键词），因为脑细胞死得有些多，资源分不少请大家见谅。
题目如下：
Q:Find all customers who have both an account and a loan at the Perryridge branch.(ps:MySQL不支持intersect运算符)
Q:Find the number of depositors for each branch.
Q:Find the names of all branches where the average account balance is more than $1,200.
Q:Find the names of all branches that have greater assets than all branches located in Brooklyn.
Q:Find all accounts with the maximum balance.
Q:Find all branches that have greater assets than some branch located in Brooklyn.
Q:Find all customers who have both an account and a loan at the bank.
Q:Find all customers who have accounts at all branches located in Brooklyn.
Q:Find the average account balance at the Perryridge branch.
Q:Find the number of tuples in the customer relation.
Q:Find the number of depositors in the bank.
Q:Find the number of depositors for each branch.
Q:Find all customers who have a loan at the bank but do not have an account at the bank.
Q:Find all branches where the total account deposit is greater than the average of the total account deposits at all branches.
Q:Find all customers who have both an account and a loan at the bank.
Q:Find all customers who have at most one account at the Perryridge branch.
Q:Provide as a gift for all loan customers of the Perryridge branch, a $200 savings account. Let the loan number serve as the account number for the new savings account.
Q:Increase all accounts with balances over $10,000 by 6%, all other accounts receiver 5%.
2022-03-16 19:51:17
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ACCESS数据库与SQL查询语句生成示例
ACCESS数据库与SQL查询语句生成示例
ACCESS数据库与SQL查询语句生成示例
2021-10-16 21:37:05
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