Add SQL SELECT function exercises.

1/GBD/tema4-ej14.sql

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+-- 4
+SELECT DISTINCT INITCAP(POSICION) FROM FUTBOLISTAS ORDER BY POSICION ASC;
+-- 5
+SELECT '--' || SUBSTR(NOMBRE,1,3) FROM FUTBOLISTAS WHERE EQUIPO=(
+	SELECT ID FROM EQUIPOS WHERE NOMBRE='A'
+);
+
+-- 6
+SELECT SUBSTR(NOMBRE,1,3) || '--' FROM FUTBOLISTAS WHERE EQUIPO=(
+	SELECT ID FROM EQUIPOS WHERE NOMBRE='A'
+);
+
+-- 8
+SELECT SUBSTR(APELLIDOS, 1, 3) FROM FUTBOLISTAS;
+
+-- 9
+SELECT replace(NOMBRE, 'LUIS', 'L.'), length(APELLIDOS) FROM FUTBOLISTAS;

1/GBD/tema4-ej15.sql

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+-- 1
+SELECT EXTRACT(DAY FROM SYSDATE), EXTRACT(MONTH FROM SYSDATE), EXTRACT(YEAR FROM SYSDATE) FROM DUAL;
+
+-- 2
+SELECT ADD_MONTHS(SYSDATE, 6) FROM DUAL;
+
+-- 3
+SELECT MONTHS_BETWEEN(SYSDATE, NACIMIENTO) FROM FUTBOLISTAS;
+
+-- 4
+SELECT LAST_DAY(SYSDATE) FROM DUAL;
+
+-- 5
+SELECT NEXT_DAY(SYSDATE, "LUNES") FROM DUAL;
+
+-- 6
+SELECT TO_CHAR(SYSDATE - 4, "DAY") "Four Days Ago", TO_CHAR(SYSDATE + 1, "DAY") "Tomorrow" FROM DUAL;

1/GBD/tema4-ej16.sql

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+-- 1
+SELECT TO_NUMBER("1000.45", "9999.99") FROM DUAL;
+
+-- 2
+SELECT TO_NUMBER("1000.45€", "9999.99L") FROM DUAL;
+
+-- 3
+SELECT TO_NUMBER("-$1000.45", "S$9999.99") FROM DUAL;
+
+-- 4
+SELECT TO_CHAR(SYSDATE, "DD/MM/YYYY") FROM DUAL;
+SELECT TO_CHAR(SYSDATE, "DD/MM/YY") FROM DUAL;
+SELECT LOWER(TO_CHAR(SYSDATE, "DD-MON-YYYY")) FROM DUAL;
+SELECT TO_CHAR(SYSDATE, "DD") || " de " ||
+	trim(LOWER(TO_CHAR(SYSDATE, "MONTH"))) || " de " ||
+	TO_CHAR(SYSDATE, "YYYY")
+	FROM DUAL;
+
+-- 5
+SELECT TO_NUMBER(SUBSTR(id, 2, LENGTH(id))) FROM FUTBOLISTAS;
+
+-- 6
+SELECT TO_CHAR(FECHA_NACIMIENTO, "YYYY") FROM FUTBOLISTAS ORDER BY 1 ASC;