idShura

SELECT content,
       REPLACE(
                CONCAT(
                       LEFT(content, LOCATE('<a href=', content)-1),
                       SUBSTRING(content, LOCATE('>', content)+1)
                       ),
                '</a>', ''
               ) new_content
  FROM site_content

SELECT   I.NAME_INSTITUTION,
         A.UID_FIELD,
         A.ANSWER_USER,
         COUNT (*) CNT_ANSWER
    FROM LIST_INSTITUTIONS I
         LEFT JOIN LIST_ANSWERS A ON A.UID_INSTITUTION = I.ID_INSTITUTION
GROUP BY I.NAME_INSTITUTION, A.UID_FIELD, A.ANSWER_USER
  HAVING COUNT (*) > 1