我試圖找到最好的方法來分解一長串點擊，進入相關的各種登陸器相關表。 SELECT LANDER, COUNT(DISTINCT IP) AS CLICKS
FROM
(
SELECT LANDER, USER_GROUP, IP
FROM
(
SELECT LANDER USER_GROUP, IP, TIME FROM CLICKS_IN WHERE
我不是那麼到數據庫和我對這個查詢的可能的優化（一的MySql數據庫中定義）以下疑問： SELECT MCPS.id AS series_id,
MD_CD.market_details_id AS market_id,
MD_CD.commodity_details_id AS commodity_id,
MD.market_name AS market_nam
請考慮下面的例子： DROP TABLE IF EXISTS t1;
CREATE TABLE t1(a INTEGER PRIMARY KEY, b) WITHOUT ROWID;
WITH RECURSIVE
cnt(x) AS (VALUES(1000) UNION ALL SELECT x+1 FROM cnt WHERE x<2000)
INSERT INTO t1(a,
我有以下查詢： SELECT
b.business_name,
b.address,
b.city,
b.state,
b.phone_number,
i.date
FROM business_table b
LEFT JOIN inspection_table i ON b.id = i.business_id
WHERE i.d
我有一個相當大的查詢用於'map_item'上的用戶搜索。 SELECT map_item_name
FROM map_item
LEFT JOIN map_section_item ON map_section_item_item_id = map_item_id
LEFT JOIN map_section ON map_section_id = map_section_item_sect