小编Văn*_*yễn的帖子

我的表有1个布尔列.

productid integer
isactive (boolean)

执行查询时

SELECT productid   
    FROM 
    product  
    WHERE ispublish
    LIMIT 15 OFFSET  0

Affter我为ispublish专栏创建了索引

CREATE INDEX idx_product_ispublish ON product USING btree (ispublish)

re execute
SELECT productid   
       FROM 
       product  
       WHERE ispublish
       LIMIT 15 OFFSET  0
result 

=>没有差别我已经尝试但结果是一样的

CREATE INDEX idx_product_ispublish ON product USING btree (ispublish)

CREATE INDEX idx_product_ispublish ON product USING btree (ispublish)

CREATE INDEX idx_product_ispublish ON product (ispublish) WHERE ispublish is TRUE

谁能向我解释一下？