-- Database schema
| essays : projectid [ TEXT ] , teacher_acctid [ TEXT ] , title [ TEXT ] , short_description [ TEXT ] , need_statement [ TEXT ] , essay [ TEXT ] | projects : projectid [ TEXT ] primary_key , teacher_acctid [ TEXT ] , schoolid [ TEXT ] , school_ncesid [ TEXT ] , school_latitude [ REAL ] , school_longitude [ REAL ] , school_city [ TEXT ] , school_state [ TEXT ] , school_zip [ INTEGER ] , school_metro [ TEXT ] , school_district [ TEXT ] , school_county [ TEXT ] , school_charter [ TEXT ] , school_magnet [ TEXT ] , school_year_round [ TEXT ] , school_nlns [ TEXT ] , school_kipp [ TEXT ] , school_charter_ready_promise [ TEXT ] , teacher_prefix [ TEXT ] , teacher_teach_for_america [ TEXT ] , teacher_ny_teaching_fellow [ TEXT ] , primary_focus_subject [ TEXT ] , primary_focus_area [ TEXT ] , secondary_focus_subject [ TEXT ] , secondary_focus_area [ TEXT ] , resource_type [ TEXT ] , poverty_level [ TEXT ] , grade_level [ TEXT ] , fulfillment_labor_materials [ REAL ] , total_price_excluding_optional_support [ REAL ] , total_price_including_optional_support [ REAL ] , students_reached [ INTEGER ] , eligible_double_your_impact_match [ TEXT ] , eligible_almost_home_match [ TEXT ] , date_posted [ DATE ] | donations : donationid [ TEXT ] primary_key , projectid [ TEXT ] donations.projectid = projects.projectid , donor_acctid [ TEXT ] , donor_city [ TEXT ] , donor_state [ TEXT ] , donor_zip [ TEXT ] , is_teacher_acct [ TEXT ] , donation_timestamp [ DATETIME ] , donation_to_project [ REAL ] , donation_optional_support [ REAL ] , donation_total [ REAL ] , dollar_amount [ TEXT ] , donation_included_optional_support [ TEXT ] , payment_method [ TEXT ] , payment_included_acct_credit [ TEXT ] , payment_included_campaign_gift_card [ TEXT ] , payment_included_web_purchased_gift_card [ TEXT ] , payment_was_promo_matched [ TEXT ] , via_giving_page [ TEXT ] , for_honoree [ TEXT ] , donation_message [ TEXT ] | resources : resourceid [ TEXT ] primary_key , projectid [ TEXT ] resources.projectid = projects.projectid , vendorid [ INTEGER ] , vendor_name [ TEXT ] , project_resource_type [ TEXT ] , item_name [ TEXT ] , item_number [ TEXT ] , item_unit_price [ REAL ] , item_quantity [ INTEGER ] |
-- -- Which resource type is commonly bought by the Los Angeles Unified School District?

SELECT T1.project_resource_type FROM resources AS T1 INNER JOIN projects AS T2 ON T1.projectid = T2.projectid WHERE T2.school_district = 'Los Angeles Unif Sch Dist' GROUP BY T2.school_district ORDER BY COUNT(T1.project_resource_type) DESC LIMIT 1;