Using MYSQL 5.7.21 and WorkBench 6.3 and need to delete all players who live in the same town as player 57 but keep the data about player 57 (you may need to alias the sub-query on the town name for 57). Have written the following, but in DELETE statement get, Syntax error: unexpected '@TOWN_57' (at text suffix), with @TOWN_57 underlined before execution.

SET @TOWN_57 = (SELECT TOWN

FROM PLAYERS

WHERE PLAYERNO = '57');

DELETE FROM PLAYERS WHERE TOWN in (SELECT TOWN FROM PLAYERS WHERE PLAYERNO = '57') AND PLAYERNO NOT IN @TOWN_57;

USE TENNIS;

DROP TABLE PLAYERS; DROP TABLE TEAMS; DROP TABLE MATCHES; DROP TABLE PENALTIES; DROP TABLE COMMITTEE_MEMBERS; CREATE TABLE PLAYERS (PLAYERNO INTEGER NOT NULL, NAME CHAR(15) NOT NULL, INITIALS CHAR(3) NOT NULL, BIRTH_DATE DATE , SEX CHAR(1) NOT NULL, JOINED SMALLINT NOT NULL, STREET VARCHAR(30) NOT NULL, HOUSENO CHAR(4) , POSTCODE CHAR(6) , TOWN VARCHAR(30) NOT NULL, PHONENO CHAR(13) , LEAGUENO CHAR(4) , PRIMARY KEY (PLAYERNO) ); CREATE TABLE TEAMS (TEAMNO INTEGER NOT NULL, PLAYERNO INTEGER NOT NULL, DIVISION CHAR(6) NOT NULL, PRIMARY KEY (TEAMNO) ); CREATE TABLE MATCHES (MATCHNO INTEGER NOT NULL, TEAMNO INTEGER NOT NULL, PLAYERNO INTEGER NOT NULL, WON SMALLINT NOT NULL, LOST SMALLINT NOT NULL, PRIMARY KEY (MATCHNO) ); CREATE TABLE PENALTIES (PAYMENTNO INTEGER NOT NULL, PLAYERNO INTEGER NOT NULL, PAYMENT_DATE DATE NOT NULL, AMOUNT DECIMAL(7,2) NOT NULL, PRIMARY KEY (PAYMENTNO) ); CREATE TABLE COMMITTEE_MEMBERS (PLAYERNO INTEGER NOT NULL, BEGIN_DATE DATE NOT NULL, END_DATE DATE , POSITION CHAR(20) , PRIMARY KEY (PLAYERNO, BEGIN_DATE));

INSERT INTO PLAYERS VALUES ( 2, 'Everett', 'R', '1948-09-01', 'M', 1975, 'Stoney Road', '43', '3575NH', 'Stratford', '070-237893', '2411'); INSERT INTO PLAYERS VALUES ( 6, 'Parmenter', 'R', '1964-06-25', 'M', 1977, 'Haseltine Lane', '80', '1234KK', 'Stratford', '070-476537', '8467'); INSERT INTO PLAYERS VALUES ( 7, 'Wise', 'GWS', '1963-05-11', 'M', 1981, 'Edgecombe Way', '39', '9758VB', 'Stratford', '070-347689', NULL); INSERT INTO PLAYERS VALUES ( 8, 'Newcastle', 'B', '1962-07-08', 'F', 1980, 'Station Road', '4', '6584WO', 'Inglewood', '070-458458', '2983'); INSERT INTO PLAYERS VALUES ( 27, 'Collins', 'DD', '1964-12-28', 'F', 1983, 'Long Drive', '804', '8457DK', 'Eltham', '079-234857', '2513'); INSERT INTO PLAYERS VALUES ( 28, 'Collins', 'C', '1963-06-22', 'F', 1983, 'Old Main Road', '10', '1294QK', 'Midhurst', '010-659599', NULL); INSERT INTO PLAYERS VALUES ( 39, 'Bishop', 'D', '1956-10-29', 'M', 1980, 'Eaton Square', '78', '9629CD', 'Stratford', '070-393435', NULL); INSERT INTO PLAYERS VALUES ( 44, 'Baker', 'E', '1963-01-09', 'M', 1980, 'Lewis Street', '23', '4444LJ', 'Inglewood', '070-368753', '1124'); INSERT INTO PLAYERS VALUES ( 57, 'Brown', 'M', '1971-08-17', 'M', 1985, 'Edgecombe Way', '16', '4377CB', 'Stratford', '070-473458', '6409'); INSERT INTO PLAYERS VALUES ( 83, 'Hope', 'PK', '1956-11-11', 'M', 1982, 'Magdalene Road', '16A', '1812UP', 'Stratford', '070-353548', '1608'); INSERT INTO PLAYERS VALUES ( 95, 'Miller', 'P', '1963-05-14', 'M', 1972, 'High Street', '33A', '5746OP', 'Douglas', '070-867564', NULL); INSERT INTO PLAYERS VALUES ( 100, 'Parmenter', 'P', '1963-02-28', 'M', 1979, 'Haseltine Lane', '80', '6494SG', 'Stratford', '070-494593', '6524'); INSERT INTO PLAYERS VALUES ( 104, 'Moorman', 'D', '1970-05-10', 'F', 1984, 'Stout Street', '65', '9437AO', 'Eltham', '079-987571', '7060'); INSERT INTO PLAYERS VALUES ( 112, 'Bailey', 'IP', '1963-10-01', 'F', 1984, 'Vixen Road', '8', '6392LK', 'Plymouth', '010-548745', '1319'); INSERT INTO TEAMS VALUES (1, 6, 'first'); INSERT INTO TEAMS VALUES (2, 27, 'second'); INSERT INTO MATCHES VALUES ( 1, 1, 6, 3, 1); INSERT INTO MATCHES VALUES ( 2, 1, 6, 2, 3); INSERT INTO MATCHES VALUES ( 3, 1, 6, 3, 0); INSERT INTO MATCHES VALUES ( 4, 1, 44, 3, 2); INSERT INTO MATCHES VALUES ( 5, 1, 83, 0, 3); INSERT INTO MATCHES VALUES ( 6, 1, 2, 1, 3); INSERT INTO MATCHES VALUES ( 7, 1, 57, 3, 0); INSERT INTO MATCHES VALUES ( 8, 1, 8, 0, 3); INSERT INTO MATCHES VALUES ( 9, 2, 27, 3, 2); INSERT INTO MATCHES VALUES (10, 2, 104, 3, 2); INSERT INTO MATCHES VALUES (11, 2, 112, 2, 3); INSERT INTO MATCHES VALUES (12, 2, 112, 1, 3); INSERT INTO MATCHES VALUES (13, 2, 8, 0, 3); INSERT INTO PENALTIES VALUES (1, 6, '1980-12-08',100); INSERT INTO PENALTIES VALUES (2, 44, '1981-05-05', 75); INSERT INTO PENALTIES VALUES (3, 27, '1983-09-10',100); INSERT INTO PENALTIES VALUES (4,104, '1984-12-08', 50); INSERT INTO PENALTIES VALUES (5, 44, '1980-12-08', 25); INSERT INTO PENALTIES VALUES (6, 8, '1980-12-08', 25); INSERT INTO PENALTIES VALUES (7, 44, '1982-12-30', 30); INSERT INTO PENALTIES VALUES (8, 27, '1984-11-12', 75); INSERT INTO COMMITTEE_MEMBERS VALUES ( 6, '1990-01-01', '1990-12-31', 'Secretary'); INSERT INTO COMMITTEE_MEMBERS VALUES ( 6, '1991-01-01', '1992-12-31', 'Member'); INSERT INTO COMMITTEE_MEMBERS VALUES ( 6, '1992-01-01', '1993-12-31', 'Treasurer'); INSERT INTO COMMITTEE_MEMBERS VALUES ( 6, '1993-01-01', NULL, 'Chairman'); INSERT INTO COMMITTEE_MEMBERS VALUES ( 2, '1990-01-01', '1992-12-31', 'Chairman'); INSERT INTO COMMITTEE_MEMBERS VALUES ( 2, '1994-01-01', NULL, 'Member'); INSERT INTO COMMITTEE_MEMBERS VALUES (112, '1992-01-01', '1992-12-31', 'Member'); INSERT INTO COMMITTEE_MEMBERS VALUES (112, '1994-01-01', NULL, 'Secretary'); INSERT INTO COMMITTEE_MEMBERS VALUES ( 8, '1990-01-01', '1990-12-31', 'Treasurer'); INSERT INTO COMMITTEE_MEMBERS VALUES ( 8, '1991-01-01', '1991-12-31', 'Secretary'); INSERT INTO COMMITTEE_MEMBERS VALUES ( 8, '1993-01-01', '1993-12-31', 'Member'); INSERT INTO COMMITTEE_MEMBERS VALUES ( 8, '1994-01-01', NULL, 'Member'); INSERT INTO COMMITTEE_MEMBERS VALUES ( 57, '1992-01-01', '1992-12-31', 'Secretary'); INSERT INTO COMMITTEE_MEMBERS VALUES ( 27, '1990-01-01', '1990-12-31', 'Member'); INSERT INTO COMMITTEE_MEMBERS VALUES ( 27, '1991-01-01', '1991-12-31', 'Treasurer'); INSERT INTO COMMITTEE_MEMBERS VALUES ( 27, '1993-01-01', '1993-12-31', 'Treasurer'); INSERT INTO COMMITTEE_MEMBERS VALUES ( 95, '1994-01-01', NULL, 'Treasurer'); show tables;