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  • sql cheat sheet

    CREATE DATABASE DATA_NAME
    drop database database_name
    
    
    create table person
    (
    	lastname varchar,
    	firstname varchar,
    	address varchar,
    	age int
    )
    
    
    alter tale table_name add column_name data_type
    alter table table_name ddrop column_name datatype
    drop table table_name
    
    
    create index person_index
    on person ( lastname, firstname )
    
    creaete unique indeix personindex
    on person( lastname desc )
    
    drop index person personindex
    
    insert into persons values ( 'hussein', 'saddam', ' white house' )
    insert into persons( lastname, firstname, address )
    values ( 'hussein', 'saddam', 'white house' )
    
    update person set address = 'ups' whwere last name = 'hussein'
    
    
    delete from person where lastname = 'hussein'
    
    truncate table person
    
    select lastname,firstname from persons
    select * from persons
    select distincet lastname,firstname from persons
    select * from persons where sex='female'
    select * from persons where year > 1970
    select * from persons where firstname = 'saddam' and lastname = 'hussein'
    select * from persons where firstname = 'saddam' or lastname = 'hussein'
    
    select * from persons where ( firstname = 'tove' or firstname = 'stephen' )
    and lastname = 'swendson'
    
    select * from persons where firstname like '0%'
    select * from persons where firstname like '%a'
    select * from persons where firstname like '%1a%'
    
    select * from persons where lastname in ( 'hansen', 'pettersen' )
    
    select * from persons order by lastname
    select firstname, lastname f rom persons order by lastname desc
    
    select company, ordernumber from orders order by company
    desc, ordernumber asc
    
    select company, sum( amount) from sales group by company
    
    
    select company, sum( amount ) from sales group by company having sum( amount ) > 1000
    
    select lastname as family, firstname as name from persons
    select lastname,firstname from person as  employees 
    
    
    
    select employees.name, orders.product from employees inner join orders
    on employees.employee_id = order.employee_id
    
    select empoyees.name, orders.product from employees left join orders
    on empoyees.employee_id = orders.employee_id
    
    select employees.name, orders.product from employees right join ordoers on employees.employee_id = orders.employee_id
    
    
    select e_name from employees_norway union 
    select e_name from employees_usa
    
    select e_name from empoyees_norway
    union all
    select e_name from employees_usa
    
    
    select * into persons_backup from persons
    select person.* into persons in 'backup.db' from persons where city='sandnes'
    
    create view [current product list] as select productid, productname from products where discontinued = no
    
    
    
    
    
    
    
    
    
    
    


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  • 原文地址:https://www.cnblogs.com/qwop/p/3438436.html
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