我需要在SQL server上编写一个查询,以获得特定表中的列列表,其相关数据类型(长度)以及它们是否不为空。我已经做到了这么多。

但现在我还需要得到,在同一个表中,对一个列- TRUE,如果该列是一个主键。

我该怎么做呢?

我的期望输出是:

Column name | Data type | Length | isnull | Pk

当前回答

在SQL 2012中,你可以使用:

EXEC sp_describe_first_result_set N'SELECT * FROM [TableName]'

这将为您提供列名及其属性。

其他回答

在查询编辑器中选择表名并按Alt+F1,它将带来表的所有信息。

我刚刚做了marc_s“presentation ready”:

SELECT 
    c.name 'Column Name',
    t.name 'Data type',
    IIF(t.name = 'nvarchar', c.max_length / 2, c.max_length) 'Max Length',
    c.precision 'Precision',
    c.scale 'Scale',
    IIF(c.is_nullable = 0, 'No', 'Yes') 'Nullable',
    IIF(ISNULL(i.is_primary_key, 0) = 0, 'No', 'Yes') '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')

试试这个:

select COLUMN_NAME, DATA_TYPE, CHARACTER_MAXIMUM_LENGTH, IS_NULLABLE 
from INFORMATION_SCHEMA.COLUMNS IC
where TABLE_NAME = 'tablename' and COLUMN_NAME = 'columnname'

抛出了另一种在SQL server中解决问题的方法。 我的小脚本在这里应该返回列名,数据类型,是空的,约束和索引名称。 您还可以包括任何额外的列,如精度,比例… (你需要用你的数据库名、Schema name和Table name替换数据库名) .返回列的顺序与从'select * from table'中返回列的顺序相同

USE DBA -- Replace Database Name with yours

DECLARE @SCHEMA VARCHAR(MAX)
DECLARE @TABLE_NAME VARCHAR(MAX)
DECLARE @SCHEMA_TABLE_NAME VARCHAR(MAX)

SET @SCHEMA = REPLACE(REPLACE('[SCHEMA NAME]', '[', ''), ']', '')--Replace Schema Name with yours
SET @TABLE_NAME = REPLACE(REPLACE('[TABLE NAME]', '[', ''), ']', '') --' Replace Table  Name with yours
SET @SCHEMA_TABLE_NAME = @SCHEMA + '.' + @TABLE_NAME;


WITH SchemaColumns
AS (
    SELECT C.COLUMN_NAME,
        IS_NULLABLE,
        DATA_TYPE,
        CHARACTER_MAXIMUM_LENGTH,
        C.ORDINAL_POSITION
    FROM INFORMATION_SCHEMA.COLUMNS AS C
    WHERE C.TABLE_SCHEMA = @SCHEMA
        AND C.TABLE_NAME = @TABLE_NAME
    ),
SchemaConstraints
AS (
    SELECT CN.COLUMN_NAME,
        CC.CONSTRAINT_TYPE
    FROM INFORMATION_SCHEMA.TABLE_CONSTRAINTS AS CC
    INNER JOIN INFORMATION_SCHEMA.CONSTRAINT_COLUMN_USAGE AS CN ON CC.CONSTRAINT_NAME = CC.CONSTRAINT_NAME
    WHERE CC.TABLE_SCHEMA = @SCHEMA
        AND CC.TABLE_NAME = @TABLE_NAME
    ),
SchemaIndex
AS (
    SELECT I.name AS index_name,
        COL_NAME(IC.object_id, IC.column_id) AS column_name,
        IC.index_column_id,
        IC.key_ordinal,
        IC.is_included_column
    FROM sys.indexes AS i
    INNER JOIN sys.index_columns AS IC ON I.object_id = IC.object_id
        AND I.index_id = IC.index_id
    WHERE I.object_id = OBJECT_ID(@SCHEMA_TABLE_NAME)
    )
SELECT ISNULL(SchemaColumns.COLUMN_NAME, '') "Column Name",
    CASE 
        WHEN SchemaColumns.CHARACTER_MAXIMUM_LENGTH IS NULL
            THEN UPPER(ISNULL(SchemaColumns.DATA_TYPE, ''))
        ELSE CONCAT (
                UPPER(ISNULL(SchemaColumns.DATA_TYPE, '')),
                '(',
                CAST(SchemaColumns.CHARACTER_MAXIMUM_LENGTH AS VARCHAR(50)),
                ')'
                )
        END "Data Type",
    SchemaColumns.IS_NULLABLE "Is Nullable",
    ISNULL(SchemaConstraints.CONSTRAINT_TYPE, '-') "Constraints",
    ISNULL(STRING_AGG(CONVERT(NVARCHAR(max), SchemaIndex.INDEX_NAME), CHAR(13)), '-') "Indexes Names"
FROM SchemaColumns
LEFT JOIN SchemaConstraints ON SchemaConstraints.COLUMN_NAME = SchemaColumns.COLUMN_NAME
LEFT JOIN SchemaIndex ON SchemaColumns.COLUMN_NAME = SchemaIndex.COLUMN_NAME
GROUP BY SchemaColumns.COLUMN_NAME,
    SchemaColumns.DATA_TYPE,
    SchemaColumns.CHARACTER_MAXIMUM_LENGTH,
    SchemaColumns.IS_NULLABLE,
    SchemaConstraints.CONSTRAINT_TYPE,
    SchemaColumns.ORDINAL_POSITION
ORDER BY SchemaColumns.ORDINAL_POSITION
SELECT  
   T.NAME AS [TABLE NAME]
   ,C.NAME AS [COLUMN NAME]
   ,P.NAME AS [DATA TYPE]
   ,P.MAX_LENGTH AS [Max_SIZE]
   ,C.[max_length] AS [ActualSizeUsed]
   ,CAST(P.PRECISION AS VARCHAR) +'/'+ CAST(P.SCALE AS VARCHAR) AS [PRECISION/SCALE]
FROM SYS.OBJECTS AS T
JOIN SYS.COLUMNS AS C
    ON T.OBJECT_ID = C.OBJECT_ID
JOIN SYS.TYPES AS P
    ON C.SYSTEM_TYPE_ID = P.SYSTEM_TYPE_ID
    AND C.[user_type_id] = P.[user_type_id]
WHERE T.TYPE_DESC='USER_TABLE'
  AND T.name = 'InventoryStatus'
ORDER BY 2