查看SQL Server的某张表的字段，数据类型

第一种方法SELECTc.name 'Column Name',t.Name 'Data type',c.max_length 'Max Length',c.precision ,c.scale ,c.is_nullable,ISNULL(i.is_primary_key, 0) 'Primary Key'FROMsys.columns cINNER JOINsys.types t ON c.us

fengfengzai0101

2365人浏览 · 2020-05-17 18:14:43

fengfengzai0101 · 2020-05-17 18:14:43 发布

第一种方法

SELECT 
c.name 'Column Name',
t.Name 'Data type',
c.max_length 'Max Length',
c.precision ,
c.scale ,
c.is_nullable,
ISNULL(i.is_primary_key, 0) 'Primary Key'
FROM    
sys.columns c
INNER JOIN 
sys.types t ON c.user_type_id = t.user_type_id
LEFT OUTER JOIN 
sys.index_columns ic ON ic.object_id = c.object_id AND ic.column_id = c.column_id
LEFT OUTER JOIN 
sys.indexes i ON ic.object_id = i.object_id AND ic.index_id = i.index_id
WHERE
c.object_id = OBJECT_ID('YourTableName')

第二种方法

SELECT 
   c.name 'Column Name',
   t.name,
   t.name +
   CASE WHEN t.name IN ('char', 'varchar','nchar','nvarchar') THEN '('+

             CASE WHEN c.max_length=-1 THEN 'MAX'

                  ELSE CONVERT(VARCHAR(4),

                               CASE WHEN t.name IN ('nchar','nvarchar')

                               THEN  c.max_length/2 ELSE c.max_length END )

                  END +')'

      WHEN t.name IN ('decimal','numeric')

              THEN '('+ CONVERT(VARCHAR(4),c.precision)+','

                      + CONVERT(VARCHAR(4),c.Scale)+')'

              ELSE '' END

   as "DDL name",
   c.max_length 'Max Length in Bytes',
   c.precision ,
   c.scale ,
   c.is_nullable,
   ISNULL(i.is_primary_key, 0) 'Primary Key'
FROM    
   sys.columns c
INNER JOIN 
   sys.types t ON c.user_type_id = t.user_type_id
LEFT OUTER JOIN 
   sys.index_columns ic ON ic.object_id = c.object_id AND ic.column_id = c.column_id
LEFT OUTER JOIN 
   sys.indexes i ON ic.object_id = i.object_id AND ic.index_id = i.index_id
WHERE
   c.object_id = OBJECT_ID('YourTableName')
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