Question

我需要从数据库表中获取所有列名。如果它是单个表，我可以使用：

SELECT `COLUMN_NAME`
FROM `INFORMATION_SCHEMA`.`COLUMNS`
WHERE `TABLE_SCHEMA`='nameofschema'
AND `TABLE_NAME`='tbl_name'
GROUP BY `COLUMN_NAME`

现在我需要从十个表中获取列名并一次显示列名。我怎样才能做到这一点？请帮我解决这个问题。

Answer 1

像这样尝试IN()运算符

SELECT `COLUMN_NAME`
FROM `INFORMATION_SCHEMA`.`COLUMNS`
WHERE `TABLE_SCHEMA`='nameofschema'
AND `TABLE_NAME` IN ('tbl_name','tbl_name2','tbl_name3')
GROUP BY `COLUMN_NAME`

如果表位于不同的模式中，则可以使用AND，OR opeartors

的组合

SELECT `COLUMN_NAME`
FROM `INFORMATION_SCHEMA`.`COLUMNS`
WHERE (`TABLE_SCHEMA`='nameofschema' AND `TABLE_NAME` = 'tbl_name')
       OR
      (`TABLE_SCHEMA`='nameofschema1' AND `TABLE_NAME` = 'tbl_name1')
GROUP BY `COLUMN_NAME`

Answer 2

您可以使用IN()

SELECT `COLUMN_NAME`
FROM `INFORMATION_SCHEMA`.`COLUMNS`
WHERE `TABLE_SCHEMA`='dbname'
AND `TABLE_NAME` IN ('table1' ,'table2'.....)
GROUP BY `COLUMN_NAME`

或者显示数据库中的所有列

SELECT `COLUMN_NAME`
FROM `INFORMATION_SCHEMA`.`COLUMNS`
WHERE `TABLE_SCHEMA`='dbname'    
GROUP BY `COLUMN_NAME`

Answer 3

尝试

SELECT `COLUMN_NAME`
FROM `INFORMATION_SCHEMA`.`COLUMNS`
WHERE `TABLE_SCHEMA`='nameofschema'
AND `TABLE_NAME` in ('tbl_name1','tbl_name2','tbl_name3')
GROUP BY `COLUMN_NAME`

Answer 4

试试这个

SELECT Orders.OrderID, Customers.CustomerName, Orders.OrderDate
FROM Orders
INNER JOIN Customers
ON Orders.CustomerID=Customers.CustomerID;

完整详细信息请查看此http://www.w3schools.com/sql/sql_join.asp

如何通过连接表从多个表中获取所有列

4 个答案: