优化方式概述
未优化前
SELECT * FROM rb_product rb where sku in('1022044','1009786')
方案2示例
public static void main(String[] args) {//往list里面设置3000个值List<String> list = new ArrayList<>();for (int i = 0; i < 3000; i++) {list.add("" + i);}//切割成3份，每份1000条List<List<String>> split = ListUtil.split(list, 1000);for (List<String> strings : split){//分批查询}}
方案3示例
方案4示例
假设表rb_product（产品表），产品唯一标识表rb_sku
EXISTS优化优化后
SELECT rb.*
FROM rb_product rb
WHERE EXISTS (SELECT skuFROM sku_temp st where rb.sku=st.sku
);
方案5示例
方法1
创建临时表
CREATE TEMPORARY TABLE sku_temp (sku VARCHAR(50));
INSERT INTO sku_temp (sku) VALUES (1002196),(1002198),(1002200),(1002201),(1002203),(1002204),(1002254),(1002255),(1002256),(1002257);
连表查询
select rb.* from sku_temp st LEFT JOIN rb_product rb on st.sku=rb.sku;
方法2
WITH tmp_src AS (SELECT '1002196' AS skuUNION ALLSELECT '1002200' AS skuUNION ALLSELECT '1002201' AS skuUNION ALLSELECT '1002203' AS skuUNION ALLSELECT '1002204' AS sku
)select rb.* from tmp_src st LEFT JOIN rb_product rb on st.sku=rb.sku;
)
