How to get single value from two or more tables

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i need sql querry to get maximum of mobile_Id from two Tables (Mobile,DeletedMobile) can anyone help me please ?

What I have tried:

VB

com = New SqlCommand("SELECT Max(Mobile_Id) FROM Mobile UNION SELECT MAX(Mobile_Id) FROM DeleteMobile", con)
        con.Open()
        com.ExecuteNonQuery()

        If IsDBNull(com.ExecuteScalar) Then

            InsertMobile.TextBox1.Text = ""
            InsertMobile.TextBox1.Text = 1
        Else

            InsertMobile.TextBox1.Text = ""
            InsertMobile.TextBox1.Text = com.ExecuteScalar + 1
        End If


        con.Close()

Posted 1-Mar-20 8:29am

Member 14609980

Updated 1-Mar-20 16:12pm

PIEBALDconsult

v2

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Wendelius · Accepted Answer · 2020-03-01T08:37:00

Solution 1

Taken this is SQL Server, you could try something like

SQL

SELECT MAX(a.Mobile_Id)
FROM (SELECT Max(b.Mobile_Id) AS Mobile_Id
      FROM Mobile b
      UNION 
      SELECT MAX(c.Mobile_Id) AS Mobile_Id
      FROM DeleteMobile c) a

Posted 1-Mar-20 8:37am

Wendelius

Comments

Member 14609980 1-Mar-20 14:49pm

thank You Friend

Wendelius 1-Mar-20 14:53pm

You're welcome :)