Have / where子句中的未知列

Question

I am not sure if this error lies within my code or within my MySQL table configuration. - I have tried using WHERE and HAVING and I have also made the HOSTNAME primary/index key within the table. - Always the same error.

Unknown column 'HOSTNAME' in 'having/where clause'

Note: HOSTNAME is actually my machine hostname, so that's parsed properly.

The line of code:

Dim Query As String = "SELECT `HOSTNAME`, `UPDATED` FROM `" & device_1_table & _
    "` WHERE HOSTNAME = `" & device_1_column & "`"

Where do I need to look?

Answer 1

I am guessing that the variable device_1_column is set to HOSTNAME . You need single quotes, not back ticks, for string literals. So change this portion of the code:

WHERE HOSTNAME = `" & device_1_column & "`

to

WHERE HOSTNAME = '" & device_1_column & "'
-----------------^ ----------------------^