我有两个实体通过@ManyToMany将Board和TagMap到连接表board_tag_table。
如何返回board_tag_table中前5个最常见的tag_id？
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public class Board {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Integer id;

    @ManyToMany(fetch = FetchType.LAZY,cascade = CascadeType.ALL)
    @JoinTable(name = "board_tag_table",
    joinColumns = {
            //primary key of Board
            @JoinColumn(name = "id", referencedColumnName = "id")
    },
    inverseJoinColumns = {
            //primary key of Tag
            @JoinColumn(name = "tag_id", referencedColumnName = "tag_id")
    })
    private Set<Tag> tags = new HashSet<>();

}

public class Tag {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Integer tag_id;

    private String tagname;

    @JsonIgnore
    @ManyToMany(fetch = FetchType.LAZY, cascade = CascadeType.ALL, mappedBy = "tags")
    private Set<Board> boards = new HashSet<>();
}

找不到如何在多对多表中进行查询