SQL Server paging query

Question

Urggggg! I\'ve been struggling with this for a long time! I can do it with MySQL so easy but not with SQL Server :(

Here are the simplified tables which should be jo

Answer 1

I liked Taha Siddiqui's answer except that it requires modifying the passed in query and it didn't work for an SQL UNION statement that I have to use due to some very poor design decisions made by a former co-worker.

The generic SQL Server query is:

SELECT * FROM (
    select ROW_NUMBER() OVER (order by ID) as row_num, * FROM (
      <>
    ) AS tempTable1
) AS tempTable2 WHERE row_num >= ((pageNum -1) * pageSize) AND row_num < ((pageNum -1) * pageSize) + pageSize;

I created a Java function that assumes one-based paging:

    public static String buildPagingQuery(String sqlStr, String sortExpression, int pageNum, int pageSize) {
        if (StringUtils.isBlank(sortExpression)) { //NOTE: uses org.apache.commons.lang.StringUtils
            sortExpression = " (select 0)";
        }

        int startIndex = ((pageNum - 1) * pageSize) + 1;
        int endIndex = startIndex + pageSize;

        StringBuilder sb = new StringBuilder();

        sb.append("SELECT * FROM (");
        sb.append("SELECT ROW_NUMBER() OVER (ORDER BY ");
        sb.append(sortExpression);
        sb.append(") as row_num, * FROM (");
        sb.append(sqlStr);
        sb.append(") as tempTable1 ");
        sb.append(") AS tempTable2  "); 
        sb.append("WHERE row_num >= ").append(startIndex);
        sb.append(" AND row_num < ").append(endIndex);

        return sb.toString();
    }

I have not yet checked performance on a large table.