9

如何为具有主键的列打印一个“主键”？

如果表具有主键，而不是具有主键的一列和 keyType 中的其他列为空白，我将获得所有列的“主键”。

   SELECT c.TABLE_NAME, 
          c.COLUMN_NAME, 
          c.DATA_TYPE, 
          c.Column_default, 
          c.character_maximum_length, 
          c.numeric_precision, 
          c.is_nullable,
          CASE 
            WHEN u.CONSTRAINT_TYPE = 'PRIMARY KEY' THEN 'primary key'
            ELSE '' 
          END AS KeyType
     FROM INFORMATION_SCHEMA.COLUMNS as c
LEFT JOIN information_schema.table_constraints as u ON c.table_name = u.table_name
 ORDER BY table_name
4

4 回答 4

35 
SELECT  c.TABLE_NAME, c.COLUMN_NAME,c.DATA_TYPE, c.Column_default, c.character_maximum_length, c.numeric_precision, c.is_nullable
             ,CASE WHEN pk.COLUMN_NAME IS NOT NULL THEN 'PRIMARY KEY' ELSE '' END AS KeyType
FROM INFORMATION_SCHEMA.COLUMNS c
LEFT JOIN (
            SELECT ku.TABLE_CATALOG,ku.TABLE_SCHEMA,ku.TABLE_NAME,ku.COLUMN_NAME
            FROM INFORMATION_SCHEMA.TABLE_CONSTRAINTS AS tc
            INNER JOIN INFORMATION_SCHEMA.KEY_COLUMN_USAGE AS ku
                ON tc.CONSTRAINT_TYPE = 'PRIMARY KEY' 
                AND tc.CONSTRAINT_NAME = ku.CONSTRAINT_NAME
         )   pk 
ON  c.TABLE_CATALOG = pk.TABLE_CATALOG
            AND c.TABLE_SCHEMA = pk.TABLE_SCHEMA
            AND c.TABLE_NAME = pk.TABLE_NAME
            AND c.COLUMN_NAME = pk.COLUMN_NAME
ORDER BY c.TABLE_SCHEMA,c.TABLE_NAME, c.ORDINAL_POSITION
于 2011-06-27T19:54:13.790 回答
0

另外，请考虑查看：

sp_helptext N'sp_help'

有时向 MS 团队学习是一件很棒的事情。:-)

于 2011-06-27T19:57:26.390 回答
0

第一个答案的一个非常小的补充。可以同时查看 MS_Description（或其他扩展属性）

SELECT  c.TABLE_NAME, c.COLUMN_NAME,c.DATA_TYPE, c.Column_default,  c.character_maximum_length, c.numeric_precision, c.is_nullable
             ,CASE WHEN pk.COLUMN_NAME IS NOT NULL THEN 'PRIMARY KEY' ELSE '' END AS KeyType, c.ORDINAL_POSITION 
             ,convert(varchar(8000), ex.value) as coln
   FROM INFORMATION_SCHEMA.COLUMNS c
   LEFT JOIN (
       SELECT ku.TABLE_CATALOG,ku.TABLE_SCHEMA,ku.TABLE_NAME,ku.COLUMN_NAME
            FROM INFORMATION_SCHEMA.TABLE_CONSTRAINTS AS tc
            INNER JOIN INFORMATION_SCHEMA.KEY_COLUMN_USAGE AS ku
                ON tc.CONSTRAINT_TYPE = 'PRIMARY KEY' 
                AND tc.CONSTRAINT_NAME = ku.CONSTRAINT_NAME
         )   pk 
    ON  c.TABLE_CATALOG = pk.TABLE_CATALOG
            AND c.TABLE_SCHEMA = pk.TABLE_SCHEMA
            AND c.TABLE_NAME = pk.TABLE_NAME
            AND c.COLUMN_NAME = pk.COLUMN_NAME
    outer apply ::fn_listextendedproperty('MS_Description', 'schema', 'dbo', 'table', c.TABLE_NAME, 'column', c.COLUMN_NAME) ex
   ORDER BY c.TABLE_SCHEMA,c.TABLE_NAME, c.ORDINAL_POSITION
于 2017-01-18T07:22:05.300 回答
0

我发现下面的代码是查找表主键的最简单方法。它只需要information_schema.columns表和information_schema.key_column_usage表之间的左外连接。

Select 
  col.column_name, 
  col.data_type, 
  col.ordinal_position, 
  col.is_nullable, 
  case when ky.COLUMN_NAME is null then 0 else 1 end as primary_key_flag
from <your-catalog>.Information_Schema.columns col
  left outer join <your-catalog>.INFORMATION_SCHEMA.KEY_COLUMN_USAGE ky
    on ky.COLUMN_NAME = col.COLUMN_NAME and ky.TABLE_NAME = col.TABLE_NAME 
      and ky.TABLE_CATALOG = col.TABLE_CATALOG and ky.table_name = col.table_name
where 
  col.TABLE_NAME = '<your-table-name>' 
  and col.table_catalog = '<your-catalog>';

注意： 此代码是使用 SQL Server 2017 Express (14.0.1000) 构建的，在创建主键后，我能够在KEY_COLUMN_USAGE表中看到这些值。我还在CONSTRAINT_TABLE_USAGE中看到了一条记录，它标识了constraint_name，但我发现这并不是获取显示主键的连接的必要条件。

最后一点： 在远离数据库（使用 MySQL）近十年后，我才刚刚回到个人项目中的 SQL 服务器，所以我离这个主题的专家还差得很远。

于 2018-12-08T18:27:11.793 回答