힘들 게 짠 쿼리가 작동은 하는데 효율성이 있는지 모르겠어요

<query id="쿼리이름" action="select">
    <tables>
        <table name="document_categories" alias="cate" />
    </tables>
    <columns>
        <column name="cate.*" />
        <query id="getCategoryDocumentCount" alias="document_count">
            <tables>
                <table name="documents" alias="doc" />
            </tables>
            <columns>
                <column name="count(*)" alias="count" />
            </columns>
            <conditions>
                <condition operation="equal" column="doc.category_srl" default="cate.category_srl" />
                <query operation="in" column="doc.document_srl" pipe="and">
                    <tables>
                        <table name="document_extra_vars" alias="extra" />
                    </tables>
                    <columns>
                        <column name="extra.document_srl" />
                    </columns>
                    <conditions>
                        <condition operation="in" column="extra.module_srl" var="module_srl" notnull="notnull" pipe="and" />
                        <condition operation="in" column="extra.eid" var="var_ref" notnull="notnull" pipe="and" />
                        <condition operation="like_prefix" column="extra.value" var="var_ref_value" pipe="and" />
                    </conditions>
                </query>
            </conditions>
        </query>
    </columns>
    <conditions>
        <condition operation="equal" column="cate.module_srl" var="module_srl" filter="number" notnull="notnull" />
        <query operation="in" column="cate.category_srl" pipe="and">
            <tables>
                <table name="documents" alias="doc" />
            </tables>
            <columns>
                <column name="doc.category_srl" />
            </columns>
            <conditions>
                <query operation="in" column="doc.document_srl" pipe="and">
                    <tables>
                        <table name="document_extra_vars" alias="extra" />
                    </tables>
                    <columns>
                        <column name="extra.document_srl" />
                    </columns>
                    <conditions>
                        <condition operation="in" column="extra.module_srl" var="module_srl" notnull="notnull" pipe="and" />
                        <condition operation="in" column="extra.eid" var="var_ref" notnull="notnull" pipe="and" />
                        <condition operation="like_prefix" column="extra.value" var="var_ref_value" pipe="and" />
                    </conditions>
                </query>
            </conditions>
        </query>
    </conditions>
</query>