SQL 查询速度慢？

with partitionedsales as (    select         sales_id,        sales_amount,        sales_date,        ntile(2) over (order by sales_id) as partition_number -- assigns a partition number (1 or 2) to each row    from         sales    where         sales_date between '2023-01-01' and '2023-12-31')select * from partitionedsaleswhere partition_number = :partitionnumber -- replace :partitionnumber with the actual partition number (1 or 2)

async function fetchPartition(partitionNumber) {    const response = await fetch('/api/sales?partition=' + partitionNumber});    return response.json();}async function fetchData() {    try {        const [partition1, partition2] = await Promise.all([            fetchPartition(1), // Fetch the first partition            fetchPartition(2)  // Fetch the second partition        ]);        // Combine and process results        const combinedResults = [...partition1, ...partition2];        processResults(combinedResults);    } catch (error) {        console.error('Error fetching data:', error);    }}