如果我知道数据库名称和表格名称,那么我如何能够从ql服务器主数据库中找到表格的栏目。
找到任何数据库中各栏最快的方法是什么?
你们想到的是这种问答的表现如何?
select count(*) from SYSCOLUMNS where id=(select id from SYSOBJECTS where name= Categories )
我需要支持2000年及以后的ql服务器。
如果我知道数据库名称和表格名称,那么我如何能够从ql服务器主数据库中找到表格的栏目。
找到任何数据库中各栏最快的方法是什么?
你们想到的是这种问答的表现如何?
select count(*) from SYSCOLUMNS where id=(select id from SYSOBJECTS where name= Categories )
我需要支持2000年及以后的ql服务器。
视服务器的版本可能略有不同,但这项工作将在2005年进行:
SELECT
COUNT(*)
FROM
<database name>.sys.columns
WHERE
object_id = OBJECT_ID( <database name>.<owner>.<table name> )
2000年:
SELECT
COUNT(*)
FROM
<database name>.sysobjects o
INNER JOIN <database name>.syscolumns c ON
c.id = o.id
WHERE
o.name = <table name>
如果你可能有多个表格,在不同的业主下有相同的确切表格名称,那么你需要说明。 我忘记了在座标上的一栏名,以 look头顶。
更新服务器和ANSI遵守情况:
SELECT COUNT(*)
FROM
<database name>.INFORMATION_SCHEMA.COLUMNS
WHERE
TABLE_SCHEMA = <table schema> AND
TABLE_NAME = <table name>
你可以(而且应当)这样做——试图避免使用“物体”的观点——它不再得到支持,可能在服务器2008R2或以后被拆除。
相反,在数据库中使用“sys”数据:
SELECT COUNT(*)
FROM yourdatabase.sys.columns
WHERE object_id = OBJECT_ID( yourdatabase.dbo.tablename )
这样做应该trick,而且可能最容易和最快地这样做。
如何
select count(*) from <database name.information_schema.columns where table_name = <table_name>
你可以提出这样的问题。
select count(*) from information_schema.columns where table_name= yourtablename
select Object_name(object_id) as "Object Name", count(*) as "Column Count" from Course_Plannning_Expense.sys.columns
where Object_name(object_id) not like sys%
group by object_id
order by "Column Count" desc
或者,你可以把所有表格列在其栏目中。
SELECT COUNT(column_name) as "column_count", table_name
FROM INFORMATION_SCHEMA.COLUMNS GROUP BY table_name ORDER BY "column_count" DESC
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