SQL - How to get first and last record from union table?

Question

SELECT * FROM (
SELECT id_product, picture_url, product_name, product_price, tracking_link, '$ecommerce2->nama_ecommerce' AS table_identity FROM table1 WHERE product_name LIKE '%$search%'
                    UNION
SELECT id_product, picture_url, product_name, product_price, tracking_link, '$ecommerce2->nama_ecommerce' AS table_identity FROM table2 WHERE product_name LIKE '%$search%'
            ) AS big_table ORDER BY big_table.product_price DESC
            LIMIT 1

How to get first and the last record from sql above?

Answer 1

只需在desc （用于最后一条记录）和asc （用于第一条记录）之间切换，而limit 1仅用于一条记录。

Answer 2

Assuming your Union is duplicated for a reason:

SELECT * FROM (
   SELECT id_product, picture_url, product_name, product_price, tracking_link, '$ecommerce2->nama_ecommerce' AS table_identity FROM table1 WHERE product_name LIKE '%$search%'
                    UNION ALL
   SELECT id_product, picture_url, product_name, product_price, tracking_link, '$ecommerce2->nama_ecommerce' AS table_identity FROM table2 WHERE product_name LIKE '%$search%'
 ) AS big_table1 ORDER BY product_price LIMIT 1

UNION

SELECT * FROM (
    SELECT id_product, picture_url, product_name, product_price, tracking_link, '$ecommerce2->nama_ecommerce' AS table_identity FROM table1 WHERE product_name LIKE '%$search%'
                        UNION ALL
    SELECT id_product, picture_url, product_name, product_price, tracking_link, '$ecommerce2->nama_ecommerce' AS table_identity FROM table2 WHERE product_name LIKE '%$search%'
 ) AS big_table2 ORDER BY product_price DESC LIMIT 1

Answer 3

(SELECT * FROM (
   SELECT id_product, picture_url, product_name, product_price, tracking_link, '$ecommerce2->nama_ecommerce' AS table_identity FROM table1 WHERE product_name LIKE '%$search%'
                    UNION ALL
   SELECT id_product, picture_url, product_name, product_price, tracking_link, '$ecommerce2->nama_ecommerce' AS table_identity FROM table2 WHERE product_name LIKE '%$search%'
 ) AS big_table1 ORDER BY product_price LIMIT 1)

UNION

(SELECT * FROM (
    SELECT id_product, picture_url, product_name, product_price, tracking_link, '$ecommerce2->nama_ecommerce' AS table_identity FROM table1 WHERE product_name LIKE '%$search%'
                        UNION ALL
    SELECT id_product, picture_url, product_name, product_price, tracking_link, '$ecommerce2->nama_ecommerce' AS table_identity FROM table2 WHERE product_name LIKE '%$search%'
 ) AS big_table2 ORDER BY product_price DESC LIMIT 1)