A collection of sophisticated SQL statement techniques

Source: Internet
Author: User
Keywords Network programming Database synthesis
Tags copy data name network network programming programming select show

Subtle "SQL" statements:

Copy table (copy structure only, source table name: A new table name: b)

Sql:select * into B from where 1<>1

Copy table (copy data, source table name: A target table name: b)

Sql:insert into B (A, B, c) select d,e,f from B;

Show article, submitter, and last reply time

Sql:select a.title,a.username,b.adddate from Table A,

(select Max (adddate) adddate from table where Table.title=a.title) b

Description: Outer join query (table name 1:a table name 2:b)

Sql:select a.a, A.B, A.C, B.C, B.D, B.f from a left-out JOIN b on a.a =


Schedule five minutes Advance reminder

Sql:select * from schedule where DateDiff (' minute ', F start time, GETDATE ()) >5

Two related tables, deleting information that is already not in the secondary table in the primary table


Delete from info where NOT exists

(SELECT * from Infobz where Info.infid=infobz.infid)



SELECT A.num, A.name, B.upd_date, b.prev_upd_date

From TABLE1, (SELECT x.num, X.upd_date, y.upd_date

Prev_upd_date from (SELECT NUM, Upd_date, Inbound_qty,

Stock_onhand from TABLE2 WHERE to_char (upd_date,

' yyyy/mm ') = To_char (sysdate, ' yyyy/mm ')) X,

(SELECT NUM, Upd_date, Stock_onhand from TABLE2

WHERE to_char (upd_date, ' yyyy/mm ') = To_char (to_date

(To_char (sysdate, ' yyyy/mm ') ¦¦ '/01 ', '

yyyy ')-1, ' yyyy/mm ') Y, where x.num = Y.num

(+) and X.inbound_qty + NVL (y.stock_onhand,0) <>

X.stock_onhand) B WHERE a.num = B.num



SELECT * from Studentinfo where NOT EXISTS (SELECT * from student where

studentinfo.id=student.id) and system name = ' &strdepartmentname& ' and professional name

= ' &strprofessionname& ' ORDER by sex, source of students, college entrance examination score.

Related Article

Contact Us

The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion; products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the content of the page makes you feel confusing, please write us an email, we will handle the problem within 5 days after receiving your email.

If you find any instances of plagiarism from the community, please send an email to: info-contact@alibabacloud.com and provide relevant evidence. A staff member will contact you within 5 working days.

A Free Trial That Lets You Build Big!

Start building with 50+ products and up to 12 months usage for Elastic Compute Service

  • Sales Support

    1 on 1 presale consultation

  • After-Sales Support

    24/7 Technical Support 6 Free Tickets per Quarter Faster Response

  • Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.