简单的SELECT语句:
SELECT[ALL|DISTINCT]select list
[INTO new_table]
FROM table_source
[WHERE search_conditions]
[GROUP BY group_by_expression] '分组
[HAVING search_conditions] 'having子句
[ORDER BY order_expression[ASC|DESC]] '排序
设置查询语句
select * from...where...and ..
排序
select * from result_Info where student_ID=1
order by...DESC '降序排序
order by...ASC '增序排序
使用函数
select max(result)from result_Info where... =...and ...=... '最大(最小min)
select avg(result)from result_Info where... =...and...=... '平均数
select sum(result)from result_Info where... =...and ...=... '求和
使用HAVING子句
用在查询语句下边
INSERT… SELECT语句
INSERT table_name[column_list]
SELECT column_list
FROM table_list
WHERE search_condirions
SELECT…INTO语句
SELECT <select_list>
INTO new table
FROM {<table_source>},[,...n]
WHERE <search_condition>
UPDATE语句
UPDATE [TOP] {table_name|view_name}
SET
{column name={expression|DEFAUIT|NULL}|@variable=expression}[,...n]
WHERE {search_conditions}
DELETE语句
DELETE FROM <table name>
[WHERE <search condition>]
TOP关键字和表达式
[
TOP (expression)[PERCENT]
[WITH TIES]
]
用在增删改查四种语句中,在关键字后用TOP关键字
expression具体数值
PERCENT百分比
COMPUTE子句
[
COMPUTE
{{AVG|COUNT|MAX|MIN|STDEV|STDEVP|VAR|VARP|SUM}
(expression)}[,...n]
[BY expression[,...n]
]
在where子句中使用运算符
在子句中可以使用:and or + - * % in 等等,不仅仅是只能使用等于