Question

如何用select 语句查询后，输出指定类型数据

Answer 1

select [要查询的字段] from [表名]
where [指定的查询条件]
有记得需要说明的是，如果存在多个条件时需要用and 连接每个查询条件，如果需要排序，语法则为：
select [要查询的字段] from [表名]
where [指定的查询条件]
order by [要分组的字段]

Answer 2

1.查询数据库中的所有数据库名：
SELECT Name FROM Master..SysDatabases ORDER BY Name

2.查询某个数据库中所有的表名：
SELECT Name FROM SysObjects Where XType='U' ORDER BY Name

3.查询表结构信息：

1 SELECT (case when a.colorder=1 then d.name else null end) 表名,
2 a.colorder 字段序号,a.name 字段名,
3 (case when COLUMNPROPERTY( a.id,a.name,'IsIdentity')=1 then '√'else '' end) 标识,
4 (case when (SELECT count(*) FROM sysobjects
5 WHERE (name in (SELECT name FROM sysindexes
6 WHERE (id = a.id) AND (indid in
7 (SELECT indid FROM sysindexkeys
8 WHERE (id = a.id) AND (colid in
9 (SELECT colid FROM syscolumns WHERE (id = a.id) AND (name = a.name)))))))
10 AND (xtype = 'PK'))>0 then '√' else '' end) 主键,b.name 类型,a.length 占用字节数,
11 COLUMNPROPERTY(a.id,a.name,'PRECISION') as 长度,
12 isnull(COLUMNPROPERTY(a.id,a.name,'Scale'),0) as 小数位数,(case when a.isnullable=1 then '√'else '' end) 允许空,
13 isnull(e.text,'') 默认值,isnull(g.[value], ' ') AS [说明]
14 FROM syscolumns a