```xml
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<ns4:query_definition xmlns:ns2="http://www.i2b2.org/xsd/cell/crc/psm/1.1/" xmlns:ns4="http://www.i2b2.org/xsd/cell/crc/psm/querydefinition/1.1/" xmlns:ns3="http://www.i2b2.org/xsd/cell/crc/psm/analysisdefinition/1.1/">
    <query_name>(t) Black-InfluenEssentiAcute h@11:07:54</query_name>
    <query_timing>ANY</query_timing>
    <specificity_scale>0</specificity_scale>
    <panel>
        <panel_number>1</panel_number>
        <panel_timing>ANY</panel_timing>
        <panel_accuracy_scale>100</panel_accuracy_scale>
        <invert>0</invert>
        <total_item_occurrences>1</total_item_occurrences>
        <item>
            <hlevel>3</hlevel>
            <item_name>Black</item_name>
            <item_key>\\i2b2_DEMO\i2b2\Demographics\Race\Black\</item_key>
            <item_icon>MA</item_icon>
            <tooltip>Demographic \ Race \ Black</tooltip>
            <class>ENC</class>
            <item_is_synonym>false</item_is_synonym>
        </item>
    </panel>
    <panel>
        <panel_number>2</panel_number>
        <panel_timing>ANY</panel_timing>
        <panel_accuracy_scale>100</panel_accuracy_scale>
        <invert>0</invert>
        <total_item_occurrences>1</total_item_occurrences>
        <item>
            <hlevel>2</hlevel>
            <item_name>Influenza and pneumonia (j09-j18)</item_name>
            <item_key>\\ICD10_ICD9\Diagnoses\(J00-J99) Dise~45pn\(J09-J18) Infl~7z2l\</item_key>
            <item_icon>FA</item_icon>
            <tooltip>Diagnoses \ Diseases of the respiratory system (j00-j99) \ Influenza and pneumonia (j09-j18)</tooltip>
            <class>ENC</class>
            <item_is_synonym>false</item_is_synonym>
        </item>
    </panel>
    <subquery_constraint>
        <first_query>
            <query_id>Observation A</query_id>
            <join_column>STARTDATE</join_column>
            <aggregate_operator>FIRST</aggregate_operator>
        </first_query>
        <operator>LESS</operator>
        <second_query>
            <query_id>Observation B</query_id>
            <join_column>STARTDATE</join_column>
            <aggregate_operator>FIRST</aggregate_operator>
        </second_query>
    </subquery_constraint>
    <subquery>
        <query_id>Observation A</query_id>
        <query_type>EVENT</query_type>
        <query_name>Observation A</query_name>
        <query_timing>SAMEINSTANCENUM</query_timing>
        <specificity_scale>0</specificity_scale>
        <panel>
            <panel_number>0</panel_number>
            <panel_timing>SAMEINSTANCENUM</panel_timing>
            <panel_accuracy_scale>100</panel_accuracy_scale>
            <invert>0</invert>
            <total_item_occurrences>1</total_item_occurrences>
            <item>
                <hlevel>4</hlevel>
                <item_name>Essential hypertension</item_name>
                <item_key>\\i2b2_DIAG\i2b2\Diagnoses\Circulatory system (390-459)\Hypertensive disease (401-405)\(401) Essential hypertension\</item_key>
                <item_icon>FA</item_icon>
                <tooltip>Diagnoses \ Circulatory system \ Hypertensive disease \ Essential hypertension</tooltip>
                <class>ENC</class>
                <item_is_synonym>false</item_is_synonym>
            </item>
        </panel>
    </subquery>
    <subquery>
        <query_id>Observation B</query_id>
        <query_type>EVENT</query_type>
        <query_name>Observation B</query_name>
        <query_timing>SAMEINSTANCENUM</query_timing>
        <specificity_scale>0</specificity_scale>
        <panel>
            <panel_number>0</panel_number>
            <panel_timing>SAMEINSTANCENUM</panel_timing>
            <panel_accuracy_scale>100</panel_accuracy_scale>
            <invert>0</invert>
            <total_item_occurrences>1</total_item_occurrences>
            <item>
                <hlevel>4</hlevel>
                <item_name>Acute hyperkalemia</item_name>
                <item_key>\\i2b2_DIAG\i2b2\Diagnoses\Metabolic and immunity disorders (270-279)\(276) Disorders of fluid, electro~\(276-7) Hyperpotassemia\</item_key>
                <item_icon>LA</item_icon>
                <tooltip>Diagnoses \ Metabolic and immunity disorders \ Disorders of fluid, electrolyte, and acid-base balance \ Hyperpotassemia</tooltip>
                <class>ENC</class>
                <item_is_synonym>true</item_is_synonym>
            </item>
            <item>
                <hlevel>4</hlevel>
                <item_name>Hyperkalemia</item_name>
                <item_key>\\i2b2_DIAG\i2b2\Diagnoses\Metabolic and immunity disorders (270-279)\(276) Disorders of fluid, electro~\(276-7) Hyperpotassemia\</item_key>
                <item_icon>LA</item_icon>
                <tooltip>Diagnoses \ Metabolic and immunity disorders \ Disorders of fluid, electrolyte, and acid-base balance \ Hyperpotassemia</tooltip>
                <class>ENC</class>
                <item_is_synonym>true</item_is_synonym>
            </item>
            <item>
                <hlevel>4</hlevel>
                <item_name>Chronic hyperkalemia</item_name>
                <item_key>\\i2b2_DIAG\i2b2\Diagnoses\Metabolic and immunity disorders (270-279)\(276) Disorders of fluid, electro~\(276-7) Hyperpotassemia\</item_key>
                <item_icon>LA</item_icon>
                <tooltip>Diagnoses \ Metabolic and immunity disorders \ Disorders of fluid, electrolyte, and acid-base balance \ Hyperpotassemia</tooltip>
                <class>ENC</class>
                <item_is_synonym>true</item_is_synonym>
            </item>
        </panel>
    </subquery>
</ns4:query_definition>

```

I want to find patients who have a diagnosis of essential hypertension (ICD9 code 401) in the ICD9_DIAG table at any time during their encounter and have a diagnosis of acute or chronic hyperkalemia (ICD9 code 2767) in the ICD9_DIAG table at the same instance of time or earlier. I want to exclude patients who have a diagnosis of influenza or pneumonia (ICD9 codes J09-J18) in the ICD9_DIAG table at any time during their encounter. The demographic information of the patients should include being black (Race = Black) in the DEMO table.