Ich bekomme bei der abfrage immer den Fehler das keine Datenbank ausgewählt ist.

Hallo hat jemand eine Idee wo die stellen sein könnten mehr als die 
Fehlernachicht das keine datenbank angegeben wurde, wird mir leider 
nicht angezeiget

SELECT modelfamiliy, devicemodel, firmwareversion, serialnumber, 
casename, attribute_name, attributeraw_values.attribute_valuevalue AS 
'value'
FROM smartcontrol.harddisks
INNER JOIN cases ON harddisks.FK_case = cases.PK_case
INNER JOIN attributeraw_values ON attributeraw_values.FK_harddisk = 
harddisks.PK_harddisk
INNER JOIN attributenames ON attributenames.PK_ID_attributename = 
attributeraw_values.FK_ID_attributename
WHERE cases.PK_case = 2

UNION

SELECT modelfamiliy, devicemodel, firmwareversion, serialnumber, 
casename, attribute_name, attributetypes.typevalue AS 'value'
FROM smartcontrol.harddisks
INNER JOIN cases ON harddisks.FK_case = cases.PK_case
INNER JOIN attributetypes ON attributetypes.FK_harddisk = 
harddisks.PK_harddisk
INNER JOIN attributenames ON attributenames.PK_ID_attributename = 
attributetypes.FK_ID_attributename
WHERE cases.PK_case = 2

UNION

SELECT modelfamiliy, devicemodel, firmwareversion, serialnumber, 
casename, attribute_name, attributevalues.valuevalue AS 'value'
FROM smartcontrol.harddisks
INNER JOIN cases ON harddisks.FK_case = cases.PK_case
INNER JOIN attributevalues ON attributevalues.FK_harddisk = 
harddisks.PK_harddisk
INNER JOIN attributenames ON attributenames.PK_ID_attributename = 
attributevalues.FK_ID_attributename
WHERE cases.PK_case = 2

UNION

SELECT modelfamiliy, devicemodel, firmwareversion, serialnumber, 
casename, attribute_name, attributeworsts.worstvalue AS 'value'
FROM smartcontrol.harddisks
INNER JOIN cases ON harddisks.FK_case = cases.PK_case
INNER JOIN attributeworsts ON attributeworsts.FK_harddisk = 
harddisks.PK_harddisk
INNER JOIN attributenames ON attributenames.PK_ID_attributename = 
attributeworsts.FK_ID_attributename
WHERE cases.PK_case = 2;