關聯查詢sql語句
Ⅰ sql多對一關聯查詢,sql語句怎麼寫
selectt1.name,t1.comnum,t2.comadd
fromtable1ast1
leftjointable2ast2
ont2.name=t1.name
Ⅱ 求三表聯合查詢的SQL查詢語句
1、SQL語句:select u.*,r.*,r.id rid
from user u left join sys_user_role sur on u.id = sur.useridleft join sys_role r on sur.roleid = r.id
圖片:(表名截圖)
算了,建表語句也給你們了,你們自己測試,這樣更詳細,(程序員)多動手,比什麼都好。(這里的 界面 對寫代碼不太友好,我放博客里了,自己復制粘貼測試使用就行)
sql語句地址:網頁鏈接
2、SQL語句解釋:
select a.*,b.*
from a表 a left join b表 b on a.id = b.aid
left join c表 c on b.cid = c.id
注2:此語句適合a表與c表連接,b表是關系表的情況。
Ⅲ SQL聯合查詢語句
A表欄位stuid,stuname
B表欄位bid,stuid,score,coursename,status
CREATE TABLE A#(
stuid INT,
stuname VARCHAR(10)
);
CREATE TABLE B# (
bid INT,
stuid INT,
score INT,
coursename VARCHAR(10),
status INT,
);
INSERT INTO A#
SELECT 1, '張三' UNION ALL
SELECT 2, '李四' UNION ALL
SELECT 3, '王五' UNION ALL
SELECT 4, '趙六'
;
INSERT INTO B#
SELECT 1, 1, 100, '語文', 0 UNION ALL
SELECT 2, 1, 99, '數學', 1 UNION ALL
SELECT 3, 2, 88, '語文', 0 UNION ALL
SELECT 4, 2, 88, '數學', 1 UNION ALL
SELECT 5, 3, 77, '語文', 0 UNION ALL
SELECT 6, 3, 77, '數學', 0 UNION ALL
SELECT 5, 4, 66, '語文', 1 UNION ALL
SELECT 6, 4, 66, '數學', 1
;
SELECT
A#.stuid,
B#.score,
B#.coursename,
B#.status
FROM
A# JOIN B#
ON (A#.stuid = B#.stuid AND B#.status = 1)
WHERE
NOT EXISTS (
SELECT
1
FROM
B# sub
WHERE
A#.stuid = sub.stuid
AND sub.status = 1
AND sub.score > B#.score
)
stuid score coursename status
----------- ----------- ---------- -----------
1 99 數學 1
2 88 數學 1
4 66 語文 1
4 66 數學 1
(4 行受影響)
註:
stuid = 3的,2門課程的 status 都為0,因此無數據顯示。
stuid = 4 的,2門課程都等於 max(score), 因此顯示出2行數據。
Ⅳ sql語言兩表關聯查詢語句
通過班級關聯:
select
count(學號) as 人數
,a.班級
,b.班主任
from a表 a
inner join b表 b on a.班級 = b.班級
group by a.班級,b.班主任
;
Ⅳ sql聯合查詢語句(兩張表)
sql聯合查詢語句(兩張表)是:
select A.ID,A.VALUE,A.TYPE,A.NAME,B.KEY,B.ID,B.VALUE,B.NAME
min(VALUE),max(VALUE) from A left join B on A.ID = B.ID
where B.NAME="你輸入的名字"
and B.VALUE > (select min(VALUE) from B where NAME="你輸入的名字"))
and B.VALUE < (select min(VALUE) from B where NAME="你輸入的名字"));
Ⅵ SQL語句 聯合查詢
是二條結果 呀,因為你的查詢條件是a.aid=b.aid,取的是AID為1的記錄在b表中aid 都是1
Ⅶ sql聯合查詢語句
select xyxx.sfzh,count(xyxx.sfzh) from xyxx,xyyy where xyxx.sfzh=xyyy.sfzh and syxx.sfhk=1 and cmqk=2 group by xyxx.sfzh having count(xyxx.sfzh)>=5
Ⅷ sql語句如何將三個表進行關聯查詢
select DISTINCT (a.CaseNo) CaseNo,
a.DateRecived,
a.BuildId,
a.contractNo,
MAX(b.DateOfRMI) DateOfRMI,
c.venue,
c.District
from a
left join b on a.CaseNo = b.CaseNo
left join c on a.CaseNo = c.CaseNo
你試試,我懶得建表了,不一定對,要是丟人了就別告訴我了哈~~
Ⅸ SQL語句-關聯查詢
--試試下面的語句試試:
select aa.* from (select count(a.autonumb),autonumb,sum(a.DetailPrice) as Moneya from Bookdatail a group by a.autonumb) aa left join BookCollect bb on aa.autonumb = bb.autonumb where isnull(aa.Moneya,0)<>isnull(bb.CollectPrice,0)
Ⅹ SQL語句如何寫,能對一個表進行關聯查找
select a.typename 父類,b.typename 子類 from ball_newstype a, ball_newstype b where a.id=b.parentid