要獲得表中的列總數sql

Question

我需要在sql中的查詢來獲得表中的總列。可以幫助任何人嗎？

Answer 1

SELECT COUNT(COLUMN_NAME) 
FROM INFORMATION_SCHEMA.COLUMNS 
WHERE TABLE_CATALOG = 'database' AND TABLE_SCHEMA = 'dbo' 
AND TABLE_NAME = 'table'  

Answer 2

在MS-SQL服務器7+：

SELECT count(*) 
FROM INFORMATION_SCHEMA.COLUMNS 
WHERE TABLE_NAME = 'mytable' 

Answer 3

該查詢得到的列名

SELECT COLUMN_NAME FROM INFORMATION_SCHEMA.Columns where TABLE_NAME = 'YourTableName' 

而這一次得到的計數

SELECT Count(*) FROM INFORMATION_SCHEMA.Columns where TABLE_NAME = 'YourTableName' 

Answer 4

Select Table_Name, Count(*) As ColumnCount 
From Information_Schema.Columns 
Group By Table_Name 
Order By Table_Name 

此代碼顯示了該表中列表中列出的數量爲數據庫的列數。

如果您想知道數據庫中的特定表的列數 ，那麼只需使用where子句即可。 where Table_Name='name_your_table'

Answer 5

你可以試試下面的查詢：

select 
    count(*) 
from 
    all_tab_columns 
where 
    table_name = 'your_table' 

Answer 6

更正頂部上面的查詢，允許從任何數據庫

SELECT COUNT(COLUMN_NAME) FROM [*database*].INFORMATION_SCHEMA.COLUMNS WHERE 
TABLE_CATALOG = 'database' AND TABLE_SCHEMA = 'dbo' 
AND TABLE_NAME = 'table' 

Answer 7

下面的查詢將顯示所有表和相應的列計數運行在數據庫模式中

SELECT Table_Name, count(*) as [No.of Columns] 
FROM INFORMATION_SCHEMA.COLUMNS 
WHERE table_schema = 'dbo' -- schema name 
group by table_name 

Answer 8

在我的情況下，我正在比較tabl e數據庫中2個相同表的e模式列數;一個是主數據庫，另一個是檔案數據庫。我這樣做（SQL 2012+）：

DECLARE @colCount1 INT; 
DECLARE @colCount2 INT; 

SELECT @colCount1 = COUNT(COLUMN_NAME) FROM MainDB.INFORMATION_SCHEMA.COLUMNS WHERE TABLE_NAME = 'SomeTable'; 
SELECT @colCount2 = COUNT(COLUMN_NAME) FROM ArchiveDB.INFORMATION_SCHEMA.COLUMNS WHERE TABLE_NAME = 'SomeTable'; 

IF (@colCount1 != @colCount2) THROW 5000, 'Number of columns in both tables are not equal. The archive schema may need to be updated.', 16; 

這裏要注意的重要一點是INFORMATION_SCHEMA前出線數據庫名稱（這是一種模式，像dbo）。如果將列添加到主數據庫而不添加到歸檔數據庫（如果允許運行該過程，則幾乎肯定會發生數據丟失），這將允許代碼打破。

Answer 9

這是可以做到用： -

SELECT COUNT(COLUMN_NAME) 'NO OF COLUMN' FROM INFORMATION_SCHEMA.COLUMNS 
WHERE TABLE_NAME = 'Address'