從多個Sql Tables中綁定下拉列表與唯一數據值字段？

Question

我想從多個SqlDatabase表中選擇多個列來綁定具有唯一數據值字段的DropDownLists。

這裏是類SqlQuery我的C＃代碼從表1選擇多列：

// Create a dropdownlist inside the dynamically created panel and insert in the 1st row 1st cell of dynamic html table 
var DDL = new WebForms.DropDownList(); 
DDL.ID = "MainDDL"; 
SqlDataSource da = new SqlDataSource(); 
da.ConnectionString = connection; 
string item = "--Select--"; 
da.SelectCommand = "SELECT DATA_TYPE + '_' + convert(varchar(10), ROW_NUMBER() OVER(ORDER BY DATA_TYPE))as DATA_TYPE, COLUMN_NAME FROM INFORMATION_SCHEMA.COLUMNS WHERE (TABLE_NAME = 'MyTable1' AND COLUMN_NAME IN ('Column1','Column2','Column3','Column4','Column5'))"; 
DDL.DataSource = da; 
DDL.DataTextField = "COLUMN_NAME"; 
DDL.DataValueField = "DATA_TYPE"; 
DDL.DataBind(); 

解決方案所需：從多個SQL表選擇 多列：

如何從Mytable2中選擇column1也在下面的Sql查詢中

SELECT DATA_TYPE +'_'+ convert（varchar（10），ROW_NUMBER（）OVER（ORDER BY DATA_TYPE））as DATA_TYPE，COLUMN_NAME FROM INFORMATION_SCHEMA.COLUMNS WHERE（TABLE_NAME ='MyTable1'AND COLUMN_NAME IN（'Column1'，'Column2 」， '欄3'， 'Column4'， 'Column5'））

Answer 1

問： 「如何包括Mytable2及其下面的SQL查詢COLUMN1」

答：

SELECT 
    DATA_TYPE + '_' + convert(varchar(10), ROW_NUMBER() OVER(ORDER BY DATA_TYPE))as DATA_TYPE, 
    COLUMN_NAME 
FROM INFORMATION_SCHEMA.COLUMNS 
WHERE 
    (TABLE_NAME = 'MyTable1' AND COLUMN_NAME IN ('Column1','Column2','Column3','Column4','Column5')) 
    OR 
    (TABLE_NAME = 'MyTable2' AND COLUMN_NAME IN ('Column1'))