add sql queries to the database

Author: mrk-qa

queries/average_game_length.sql

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+SELECT
+    AVG(gamelength) AS average_length
+FROM
+    "2024_lol_esports"

queries/check_columns_exist.sql

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+SELECT
+    column_name
+FROM
+    information_schema.columns
+WHERE
+    table_name = '2024_lol_esports'

queries/check_no_negative_values.sql

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+SELECT
+    COUNT(*) AS negative_count
+FROM
+    "2024_lol_esports"
+WHERE
+    kills < 0
+    OR
+    deaths < 0
+    OR
+    assists < 0
+    OR
+    gamelength < 0

queries/check_no_nulls_in_required_columns.sql

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+SELECT
+    COUNT(*) AS null_count
+FROM
+    "2024_lol_esports"
+WHERE
+    {{column_name}} IS NULL

queries/check_table_exists.sql

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+SELECT
+    to_regclass('public."2024_lol_esports"')
+IS NOT NULL AS table_exists

queries/count_unique_players.sql

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+SELECT
+    COUNT(DISTINCT playername) AS unique_players
+FROM
+    "2024_lol_esports"

queries/count_victorious_teams.sql

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+SELECT
+    COUNT(DISTINCT teamname) AS victorious_teams
+FROM
+    "2024_lol_esports"
+WHERE
+    result = 1

queries/games_with_first_blood.sql

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+SELECT
+    COUNT(*) AS games_with_first_blood
+FROM
+    "2024_lol_esports"
+WHERE
+    firstblood = 1

queries/most_played_champions.sql

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+SELECT
+    champion, COUNT(*) AS pick_count
+FROM
+    "2024_lol_esports"
+GROUP BY
+    champion
+ORDER BY
+    pick_count DESC
+LIMIT
+    10

queries/players_multiple_pentakills.sql

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+SELECT
+    playername, COUNT(pentakills) AS pentakill_count
+FROM
+    "2024_lol_esports"
+WHERE
+    pentakills IS NOT NULL
+    AND
+    pentakills <> ''
+    AND
+    playername IS NOT NULL
+    AND
+    playername <> ''
+    AND
+    CAST(pentakills AS INTEGER) > 0
+GROUP BY
+    playername
+HAVING
+    COUNT(pentakills) > 1

queries/team_highest_avg_kills.sql

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+SELECT
+    teamname, AVG(kills) AS avg_kills
+FROM
+    "2024_lol_esports"
+GROUP BY
+    teamname
+ORDER BY
+    avg_kills DESC
+LIMIT
+    1

queries/unique_champions_per_game.sql

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+SELECT
+    gameid, champion, COUNT(*) AS repeated_champions
+FROM
+    "2024_lol_esports"
+WHERE
+    champion IS NOT NULL
+    AND
+    champion <> ''
+GROUP BY
+    gameid, champion
+HAVING
+    COUNT(*) > 1

queries/victories_by_side.sql

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+SELECT
+    SUM(CASE WHEN side = 'Blue' AND result = 1 THEN 1 ELSE 0 END) AS blue_wins,
+    SUM(CASE WHEN side = 'Red' AND result = 1 THEN 1 ELSE 0 END) AS red_wins
+FROM
+    "2024_lol_esports"