我是一个新手,请大家给我一些关于SQL的启蒙教育(最好有例子),多谢了. SELECT A.id1, A.[name], (SELECT COUNT(*) FROM table2 B WHERE B.id1=A.id1) AS NUM, dbo.getstr(A.id1) FROM table1 A ---from后跟要取数据的表名,A是别名 WHERE A.id1='0' ---where后跟查询的条件 解决方案 » 免费领取超大流量手机卡,每月29元包185G流量+100分钟通话, 中国电信官方发货 看看SQL Server的帮助文件吧。 SELECT [ ALL | DISTINCT ] [ TOP n [ PERCENT ] [ WITH TIES ] ] < select_list > < select_list > ::= { * | { table_name | view_name | table_alias }.* | { column_name | expression | IDENTITYCOL | ROWGUIDCOL } [ [ AS ] column_alias ] | column_alias = expression } [ ,...n ] DELETE [ FROM ] { table_name WITH ( < table_hint_limited > [ ...n ] ) | view_name | rowset_function_limited } [ FROM { < table_source > } [ ,...n ] ] [ WHERE { < search_condition > | { [ CURRENT OF { { [ GLOBAL ] cursor_name } | cursor_variable_name } ] } } ] [ OPTION ( < query_hint > [ ,...n ] ) ] < table_source > ::= table_name [ [ AS ] table_alias ] [ WITH ( < table_hint > [ ,...n ] ) ] | view_name [ [ AS ] table_alias ] | rowset_function [ [ AS ] table_alias ] | derived_table [ AS ] table_alias [ ( column_alias [ ,...n ] ) ] | < joined_table > < joined_table > ::= < table_source > < join_type > < table_source > ON < search_condition > | < table_source > CROSS JOIN < table_source > | < joined_table > < join_type > ::= [ INNER | { { LEFT | RIGHT | FULL } [OUTER] } ] [ < join_hint > ] JOIN < table_hint_limited > ::= { FASTFIRSTROW | HOLDLOCK | PAGLOCK | READCOMMITTED | REPEATABLEREAD | ROWLOCK | SERIALIZABLE | TABLOCK | TABLOCKX | UPDLOCK } < table_hint > ::= { INDEX ( index_val [ ,...n ] ) | FASTFIRSTROW | HOLDLOCK | NOLOCK | PAGLOCK | READCOMMITTED | READPAST | READUNCOMMITTED | REPEATABLEREAD | ROWLOCK | SERIALIZABLE | TABLOCK | TABLOCKX | UPDLOCK } < query_hint > ::= { { HASH | ORDER } GROUP | { CONCAT | HASH | MERGE } UNION | FAST number_rows | FORCE ORDER | MAXDOP | ROBUST PLAN | KEEP PLAN } UPDATE { table_name WITH ( < table_hint_limited > [ ...n ] ) | view_name | rowset_function_limited } SET { column_name = { expression | DEFAULT | NULL } | @variable = expression | @variable = column = expression } [ ,...n ] { { [ FROM { < table_source > } [ ,...n ] ] [ WHERE < search_condition > ] } | [ WHERE CURRENT OF { { [ GLOBAL ] cursor_name } | cursor_variable_name } ] } [ OPTION ( < query_hint > [ ,...n ] ) ] < table_source > ::= table_name [ [ AS ] table_alias ] [ WITH ( < table_hint > [ ,...n ] ) ] | view_name [ [ AS ] table_alias ] | rowset_function [ [ AS ] table_alias ] | derived_table [ AS ] table_alias [ ( column_alias [ ,...n ] ) ] | < joined_table > < joined_table > ::= < table_source > < join_type > < table_source > ON < search_condition > | < table_source > CROSS JOIN < table_source > | < joined_table > < join_type > ::= [ INNER | { { LEFT | RIGHT | FULL } [ OUTER ] } ] [ < join_hint > ] JOIN < table_hint_limited > ::= { FASTFIRSTROW | HOLDLOCK | PAGLOCK | READCOMMITTED | REPEATABLEREAD | ROWLOCK | SERIALIZABLE | TABLOCK | TABLOCKX | UPDLOCK } < table_hint > ::= { INDEX ( index_val [ ,...n ] ) | FASTFIRSTROW | HOLDLOCK | NOLOCK | PAGLOCK | READCOMMITTED | READPAST | READUNCOMMITTED | REPEATABLEREAD | ROWLOCK | SERIALIZABLE | TABLOCK | TABLOCKX | UPDLOCK } < query_hint > ::= { { HASH | ORDER } GROUP | { CONCAT | HASH | MERGE } UNION | {LOOP | MERGE | HASH } JOIN | FAST number_rows | FORCE ORDER | MAXDOP | ROBUST PLAN | KEEP PLAN } 一条查询语句 30万条数据,如何优化?查询占用大量cpu 80%以上 怎样创建数据库与数据库之间的关联??? sql存储过程问题 导入text字段乱码 有关"select * into backup from source where 1<>1"和自动增值 一个case 语句.为什么取值有问题? sql2000 存储函数如何返回一个int数组?大家给个实例吧,谢谢了 ! 关于"sysobjects"的查找问题,谢谢 存储过程找BUG 求一SQL语句(可能比较复杂,在线...) 如何获得一条记录的当前行号??
[ TOP n [ PERCENT ] [ WITH TIES ] ]
< select_list > < select_list > ::= { *
| { table_name | view_name | table_alias }.*
| { column_name | expression | IDENTITYCOL | ROWGUIDCOL }
[ [ AS ] column_alias ]
| column_alias = expression
} [ ,...n ]
[ FROM ]
{ table_name WITH ( < table_hint_limited > [ ...n ] )
| view_name
| rowset_function_limited
} [ FROM { < table_source > } [ ,...n ] ] [ WHERE
{ < search_condition >
| { [ CURRENT OF
{ { [ GLOBAL ] cursor_name }
| cursor_variable_name
}
] }
}
]
[ OPTION ( < query_hint > [ ,...n ] ) ] < table_source > ::=
table_name [ [ AS ] table_alias ] [ WITH ( < table_hint > [ ,...n ] ) ]
| view_name [ [ AS ] table_alias ]
| rowset_function [ [ AS ] table_alias ]
| derived_table [ AS ] table_alias [ ( column_alias [ ,...n ] ) ]
| < joined_table > < joined_table > ::=
< table_source > < join_type > < table_source > ON < search_condition >
| < table_source > CROSS JOIN < table_source >
| < joined_table > < join_type > ::=
[ INNER | { { LEFT | RIGHT | FULL } [OUTER] } ]
[ < join_hint > ]
JOIN < table_hint_limited > ::=
{ FASTFIRSTROW
| HOLDLOCK
| PAGLOCK
| READCOMMITTED
| REPEATABLEREAD
| ROWLOCK
| SERIALIZABLE
| TABLOCK
| TABLOCKX
| UPDLOCK
} < table_hint > ::=
{ INDEX ( index_val [ ,...n ] )
| FASTFIRSTROW
| HOLDLOCK
| NOLOCK
| PAGLOCK
| READCOMMITTED
| READPAST
| READUNCOMMITTED
| REPEATABLEREAD
| ROWLOCK
| SERIALIZABLE
| TABLOCK
| TABLOCKX
| UPDLOCK
} < query_hint > ::=
{ { HASH | ORDER } GROUP
| { CONCAT | HASH | MERGE } UNION
| FAST number_rows
| FORCE ORDER
| MAXDOP
| ROBUST PLAN
| KEEP PLAN
}
{
table_name WITH ( < table_hint_limited > [ ...n ] )
| view_name
| rowset_function_limited
}
SET
{ column_name = { expression | DEFAULT | NULL }
| @variable = expression
| @variable = column = expression } [ ,...n ] { { [ FROM { < table_source > } [ ,...n ] ] [ WHERE
< search_condition > ] }
|
[ WHERE CURRENT OF
{ { [ GLOBAL ] cursor_name } | cursor_variable_name }
] }
[ OPTION ( < query_hint > [ ,...n ] ) ] < table_source > ::=
table_name [ [ AS ] table_alias ] [ WITH ( < table_hint > [ ,...n ] ) ]
| view_name [ [ AS ] table_alias ]
| rowset_function [ [ AS ] table_alias ]
| derived_table [ AS ] table_alias [ ( column_alias [ ,...n ] ) ]
| < joined_table > < joined_table > ::=
< table_source > < join_type > < table_source > ON < search_condition >
| < table_source > CROSS JOIN < table_source >
| < joined_table > < join_type > ::=
[ INNER | { { LEFT | RIGHT | FULL } [ OUTER ] } ]
[ < join_hint > ]
JOIN < table_hint_limited > ::=
{ FASTFIRSTROW
| HOLDLOCK
| PAGLOCK
| READCOMMITTED
| REPEATABLEREAD
| ROWLOCK
| SERIALIZABLE
| TABLOCK
| TABLOCKX
| UPDLOCK
} < table_hint > ::=
{ INDEX ( index_val [ ,...n ] )
| FASTFIRSTROW
| HOLDLOCK
| NOLOCK
| PAGLOCK
| READCOMMITTED
| READPAST
| READUNCOMMITTED
| REPEATABLEREAD
| ROWLOCK
| SERIALIZABLE
| TABLOCK
| TABLOCKX
| UPDLOCK
} < query_hint > ::=
{ { HASH | ORDER } GROUP
| { CONCAT | HASH | MERGE } UNION
| {LOOP | MERGE | HASH } JOIN
| FAST number_rows
| FORCE ORDER
| MAXDOP
| ROBUST PLAN
| KEEP PLAN
}