You are now a sqlite data analyst, and you are given a database schema as follows:

    【Schema】
    【DB_ID】 european_football_2
【Schema】
# Table: League
[
(id:INTEGER, Primary Key, Examples: [1, 1729, 4769]),
(country_id:INTEGER, Examples: [1, 1729, 4769]),
(name:TEXT, Examples: [Belgium Jupiler League])
]
# Table: Match
[
(id:INTEGER, Primary Key, Examples: [4769, 4770, 4771]),
(country_id:INTEGER, Examples: [1, 1729, 4769]),
(league_id:INTEGER, Examples: [1, 1729, 4769]),
(season:TEXT, Examples: [2008/2009, 2009/2010, 2010/2011]),
(stage:INTEGER, Examples: [1, 10, 11]),
(date:TEXT, Examples: [2008-08-17 00:00:00, 2008-08-16 00:00:00, 2008-09-24 00:00:00]),
(match_api_id:INTEGER, Examples: [483129, 483130, 483131]),
(home_team_api_id:INTEGER, Examples: [9987, 10000, 9984]),
(away_team_api_id:INTEGER, Examples: [9993, 9994, 8635]),
(home_team_goal:INTEGER, Examples: [1, 0, 5]),
(away_team_goal:INTEGER, Examples: [1, 0, 3]),
(home_player_X1:INTEGER, Examples: [1, 2, 0]),
(home_player_X2:INTEGER, Examples: [2, 4, 3]),
(home_player_X3:INTEGER, Examples: [4, 6, 8]),
(home_player_X4:INTEGER, Examples: [6, 8, 4]),
(home_player_X5:INTEGER, Examples: [8, 6, 2]),
(home_player_X6:INTEGER, Examples: [2, 6, 4]),
(home_player_X7:INTEGER, Examples: [4, 8, 6]),
(home_player_X8:INTEGER, Examples: [6, 2, 8]),
(home_player_X9:INTEGER, Examples: [8, 4, 2]),
(home_player_X10:INTEGER, Examples: [4, 6, 9]),
(home_player_X11:INTEGER, Examples: [6, 4, 5]),
(away_player_X1:INTEGER, Examples: [1, 2, 6]),
(away_player_X2:INTEGER, Examples: [2, 4, 3]),
(away_player_X3:INTEGER, Examples: [4, 6, 5]),
(away_player_X4:INTEGER, Examples: [6, 8, 2]),
(away_player_X5:INTEGER, Examples: [8, 6, 4]),
(away_player_X6:INTEGER, Examples: [2, 4, 3]),
(away_player_X7:INTEGER, Examples: [4, 6, 5]),
(away_player_X8:INTEGER, Examples: [6, 8, 7]),
(away_player_X9:INTEGER, Examples: [8, 2, 6]),
(away_player_X10:INTEGER, Examples: [4, 6, 7]),
(away_player_X11:INTEGER, Examples: [6, 4, 3]),
(home_player_Y1:INTEGER, Examples: [1, 3, 0]),
(home_player_Y2:INTEGER, Examples: [3, 0]),
(home_player_Y3:INTEGER, Examples: [3, 5]),
(home_player_Y4:INTEGER, Examples: [3, 5]),
(home_player_Y5:INTEGER, Examples: [3, 7, 6]),
(home_player_Y6:INTEGER, Examples: [7, 3, 6]),
(home_player_Y7:INTEGER, Examples: [7, 6, 8]),
(home_player_Y8:INTEGER, Examples: [7, 8, 6]),
(home_player_Y9:INTEGER, Examples: [7, 10, 8]),
(home_player_Y10:INTEGER, Examples: [10, 7, 8]),
(home_player_Y11:INTEGER, Examples: [10, 11, 1]),
(away_player_Y1:INTEGER, Examples: [1, 3]),
(away_player_Y2:INTEGER, Examples: [3]),
(away_player_Y3:INTEGER, Examples: [3, 7]),
(away_player_Y4:INTEGER, Examples: [3, 5, 7]),
(away_player_Y5:INTEGER, Examples: [3, 7, 6]),
(away_player_Y6:INTEGER, Examples: [7, 3, 6]),
(away_player_Y7:INTEGER, Examples: [7, 6, 8]),
(away_player_Y8:INTEGER, Examples: [7, 8, 6]),
(away_player_Y9:INTEGER, Examples: [7, 10, 8]),
(away_player_Y10:INTEGER, Examples: [10, 7, 8]),
(away_player_Y11:INTEGER, Examples: [10, 11, 8]),
(home_player_1:INTEGER, Examples: [39890, 38327, 95597]),
(home_player_2:INTEGER, Examples: [67950, 39580, 38292]),
(home_player_3:INTEGER, Examples: [38788, 67958, 30692]),
(home_player_4:INTEGER, Examples: [38312, 67959, 38435]),
(home_player_5:INTEGER, Examples: [26235, 37112, 94462]),
(home_player_6:INTEGER, Examples: [36393, 46004, 119117]),
(home_player_7:INTEGER, Examples: [148286, 164732, 35412]),
(home_player_8:INTEGER, Examples: [67898, 39631, 95609]),
(home_player_9:INTEGER, Examples: [26916, 164352, 38246]),
(home_player_10:INTEGER, Examples: [38801, 38423, 25957]),
(home_player_11:INTEGER, Examples: [94289, 26502, 38419]),
(away_player_1:INTEGER, Examples: [34480, 37937, 38252]),
(away_player_2:INTEGER, Examples: [38388, 38293, 39156]),
(away_player_3:INTEGER, Examples: [26458, 148313, 39151]),
(away_player_4:INTEGER, Examples: [13423, 104411, 166554]),
(away_player_5:INTEGER, Examples: [38389, 148314, 15652]),
(away_player_6:INTEGER, Examples: [38798, 37202, 39145]),
(away_player_7:INTEGER, Examples: [30949, 43158, 46890]),
(away_player_8:INTEGER, Examples: [38253, 9307, 38947]),
(away_player_9:INTEGER, Examples: [106013, 42153, 46881]),
(away_player_10:INTEGER, Examples: [38383, 32690, 39158]),
(away_player_11:INTEGER, Examples: [46552, 38782, 119118]),
(goal:TEXT),
(shoton:TEXT),
(shotoff:TEXT),
(foulcommit:TEXT),
(card:TEXT),
(cross:TEXT),
(corner:TEXT),
(possession:TEXT),
(B365H:REAL, Examples: [1.73, 1.95, 2.38]),
(B365D:REAL, Examples: [3.4, 3.2, 3.3]),
(B365A:REAL, Examples: [5.0, 3.6, 2.75]),
(BWH:REAL, Examples: [1.75, 1.8, 2.4]),
(BWD:REAL, Examples: [3.35, 3.3, 4.0]),
(BWA:REAL, Examples: [4.2, 3.95, 2.55]),
(IWH:REAL, Examples: [1.85, 1.9, 2.6]),
(IWD:REAL, Examples: [3.2, 3.1, 3.9]),
(IWA:REAL, Examples: [3.5, 2.3, 6.0]),
(LBH:REAL, Examples: [1.8, 1.9, 2.5]),
(LBD:REAL, Examples: [3.3, 3.2, 3.6]),
(LBA:REAL, Examples: [3.75, 3.5, 2.5]),
(PSH:REAL, Examples: [5.1, 2.48, 1.83]),
(PSD:REAL, Examples: [3.82, 3.52, 3.79]),
(PSA:REAL, Examples: [1.76, 2.96, 4.63]),
(WHH:REAL, Examples: [1.7, 1.83, 2.5]),
(WHD:REAL, Examples: [3.3, 3.25, 3.75]),
(WHA:REAL, Examples: [4.33, 3.6, 2.4]),
(SJH:REAL, Examples: [1.9, 1.95, 2.63]),
(SJD:REAL, Examples: [3.3, 4.0, 3.5]),
(SJA:REAL, Examples: [4.0, 3.8, 2.5]),
(VCH:REAL, Examples: [1.65, 2.0, 2.35]),
(VCD:REAL, Examples: [3.4, 3.25, 3.75]),
(VCA:REAL, Examples: [4.5, 3.25, 2.65]),
(GBH:REAL, Examples: [1.78, 1.85, 2.5]),
(GBD:REAL, Examples: [3.25, 3.2, 3.75]),
(GBA:REAL, Examples: [4.0, 3.75, 2.5]),
(BSH:REAL, Examples: [1.73, 1.91, 2.3]),
(BSD:REAL, Examples: [3.4, 3.25, 3.2]),
(BSA:REAL, Examples: [4.2, 3.6, 2.75])
]
# Table: Team_Attributes
[
(id:INTEGER, Primary Key, Examples: [1, 2, 3]),
(team_fifa_api_id:INTEGER, Examples: [434, 77, 614]),
(team_api_id:INTEGER, Examples: [9930, 8485, 8576]),
(date:TEXT, Examples: [2010-02-22 00:00:00, 2014-09-19 00:00:00, 2015-09-10 00:00:00]),
(buildUpPlaySpeed:INTEGER, Examples: [60, 52, 47]),
(buildUpPlaySpeedClass:TEXT, Examples: [Balanced, Fast, Slow]),
(buildUpPlayDribbling:INTEGER, Examples: [48, 41, 64]),
(buildUpPlayDribblingClass:TEXT, Examples: [Little, Normal, Lots]),
(buildUpPlayPassing:INTEGER, Examples: [50, 56, 54]),
(buildUpPlayPassingClass:TEXT, Examples: [Mixed, Long, Short]),
(buildUpPlayPositioningClass:TEXT, Examples: [Organised, Free Form]),
(chanceCreationPassing:INTEGER, Examples: [60, 54, 70]),
(chanceCreationPassingClass:TEXT, Examples: [Normal, Risky, Safe]),
(chanceCreationCrossing:INTEGER, Examples: [65, 63, 70]),
(chanceCreationCrossingClass:TEXT, Examples: [Normal, Lots, Little]),
(chanceCreationShooting:INTEGER, Examples: [55, 64, 70]),
(chanceCreationShootingClass:TEXT, Examples: [Normal, Lots, Little]),
(chanceCreationPositioningClass:TEXT, Examples: [Organised, Free Form]),
(defencePressure:INTEGER, Examples: [50, 47, 60]),
(defencePressureClass:TEXT, Examples: [Medium, Deep, High]),
(defenceAggression:INTEGER, Examples: [55, 44, 70]),
(defenceAggressionClass:TEXT, Examples: [Press, Double, Contain]),
(defenceTeamWidth:INTEGER, Examples: [45, 54, 70]),
(defenceTeamWidthClass:TEXT, Examples: [Normal, Wide, Narrow]),
(defenceDefenderLineClass:TEXT, Examples: [Cover, Offside Trap])
]
# Table: Country
[
(id:INTEGER, Primary Key, Examples: [1, 1729, 4769]),
(name:TEXT, Examples: [Belgium, England, France])
]
# Table: Team
[
(id:INTEGER, Primary Key, Examples: [31446, 1513, 31456]),
(team_api_id:INTEGER, Examples: [1601, 1773, 1957]),
(team_fifa_api_id:INTEGER, Examples: [673, 675, 15005]),
(team_long_name:TEXT, Examples: [KRC Genk, Beerschot AC, SV Zulte-Waregem]),
(team_short_name:TEXT, Examples: [GEN, BAC, ZUL])
]
# Table: Player_Attributes
[
(id:INTEGER, Primary Key, Examples: [1, 2, 3]),
(player_fifa_api_id:INTEGER, Examples: [218353, 189615, 186170]),
(player_api_id:INTEGER, Examples: [505942, 155782, 162549]),
(date:TEXT, Examples: [2016-02-18 00:00:00, 2015-11-19 00:00:00, 2015-09-21 00:00:00]),
(overall_rating:INTEGER, Examples: [67, 62, 61]),
(potential:INTEGER, Examples: [71, 66, 65]),
(preferred_foot:TEXT, Examples: [right, left]),
(attacking_work_rate:TEXT, Examples: [medium, high, low]),
(defensive_work_rate:TEXT, Examples: [medium, high, low]),
(crossing:INTEGER, Examples: [49, 48, 80]),
(finishing:INTEGER, Examples: [44, 43, 53]),
(heading_accuracy:INTEGER, Examples: [71, 70, 58]),
(short_passing:INTEGER, Examples: [61, 60, 71]),
(volleys:INTEGER, Examples: [44, 43, 40]),
(dribbling:INTEGER, Examples: [51, 50, 73]),
(curve:INTEGER, Examples: [45, 44, 70]),
(free_kick_accuracy:INTEGER, Examples: [39, 38, 69]),
(long_passing:INTEGER, Examples: [64, 63, 68]),
(ball_control:INTEGER, Examples: [49, 48, 71]),
(acceleration:INTEGER, Examples: [60, 79, 80]),
(sprint_speed:INTEGER, Examples: [64, 78, 82]),
(agility:INTEGER, Examples: [59, 78, 79]),
(reactions:INTEGER, Examples: [47, 46, 67]),
(balance:INTEGER, Examples: [65, 90, 87]),
(shot_power:INTEGER, Examples: [55, 54, 71]),
(jumping:INTEGER, Examples: [58, 85, 84]),
(stamina:INTEGER, Examples: [54, 79, 80]),
(strength:INTEGER, Examples: [76, 56, 50]),
(long_shots:INTEGER, Examples: [35, 34, 62]),
(aggression:INTEGER, Examples: [71, 63, 62]),
(interceptions:INTEGER, Examples: [70, 41, 40]),
(positioning:INTEGER, Examples: [45, 44, 60]),
(vision:INTEGER, Examples: [54, 53, 66]),
(penalties:INTEGER, Examples: [48, 47, 59]),
(marking:INTEGER, Examples: [65, 62, 76]),
(standing_tackle:INTEGER, Examples: [69, 66, 63]),
(sliding_tackle:INTEGER, Examples: [69, 66, 78]),
(gk_diving:INTEGER, Examples: [6, 5, 14]),
(gk_handling:INTEGER, Examples: [11, 10, 7]),
(gk_kicking:INTEGER, Examples: [10, 9, 8]),
(gk_positioning:INTEGER, Examples: [8, 7, 9]),
(gk_reflexes:INTEGER, Examples: [8, 7, 12])
]
# Table: Player
[
(id:INTEGER, Primary Key, Examples: [3879, 401, 9179]),
(player_api_id:INTEGER, Examples: [2625, 2752, 2768]),
(player_name:TEXT, Examples: [Aaron Appindangoye, Aaron Cresswell, Aaron Doran]),
(player_fifa_api_id:INTEGER, Examples: [2, 6, 11]),
(birthday:TEXT, Examples: [1992-02-29 00:00:00, 1989-12-15 00:00:00, 1991-05-13 00:00:00]),
(height:INTEGER, Examples: [182.88, 170.18, 172.72]),
(weight:INTEGER, Examples: [187, 146, 163])
]
【Foreign keys】
League.country_id=country.id
Match.away_player_11=Player.player_api_id
Match.away_player_10=Player.player_api_id
Match.away_player_9=Player.player_api_id
Match.away_player_8=Player.player_api_id
Match.away_player_7=Player.player_api_id
Match.away_player_6=Player.player_api_id
Match.away_player_5=Player.player_api_id
Match.away_player_4=Player.player_api_id
Match.away_player_3=Player.player_api_id
Match.away_player_2=Player.player_api_id
Match.away_player_1=Player.player_api_id
Match.home_player_11=Player.player_api_id
Match.home_player_10=Player.player_api_id
Match.home_player_9=Player.player_api_id
Match.home_player_8=Player.player_api_id
Match.home_player_7=Player.player_api_id
Match.home_player_6=Player.player_api_id
Match.home_player_5=Player.player_api_id
Match.home_player_4=Player.player_api_id
Match.home_player_3=Player.player_api_id
Match.home_player_2=Player.player_api_id
Match.home_player_1=Player.player_api_id
Match.away_team_api_id=Team.team_api_id
Match.home_team_api_id=Team.team_api_id
Match.league_id=League.id
Match.country_id=Country.id
Team_Attributes.team_api_id=Team.team_api_id
Team_Attributes.team_fifa_api_id=Team.team_fifa_api_id
Player_Attributes.player_api_id=Player.player_api_id
Player_Attributes.player_fifa_api_id=Player.player_fifa_api_id

    【Question】
    Among the players born before the year 1986, how many of them would remain in his position and defense while the team attacked? players born before the year 1986 refers to strftime('%Y', birthday)<'1986'; players who would remain in his position and defense while the team attacked refers to defensive_work_rate = 'high'; Should consider DISTINCT in the final result;

    【Evidence】
    players born before the year 1986 refers to strftime('%Y', birthday)<'1986'; players who would remain in his position and defense while the team attacked refers to defensive_work_rate = 'high'; Should consider DISTINCT in the final result;

    Please read and understand the database schema carefully, and generate an executable SQL based on the user's question and evidence. 

SQL: SELECT COUNT(DISTINCT t1.player_name) FROM Player AS t1 INNER JOIN Player_Attributes AS t2 ON t1.player_api_id = t2.player_api_id WHERE STRFTIME('%Y',t1.birthday) < '1986' AND t2.defensive_work_rate = 'high'