sql sum datediff

This note sorts out the video lecture "SQL from getting started to improving" trained by Yang zhongke in Chuanzhi podcast. net. Video related links: http://www.rupeng.com/forum/tj-16325-2477.html Database concepts   1. What is an index? What are the

* Description: copy a table (only copy structure, source table name: a new table name: B)Select * into B from a where 1 <> 1 * Description: copy a table (copy data, source table name: A target table name: B)Insert into B (a, B, c) Select D, E, F

Note: copy a table (only copy structure, source table name: a new table name: B)Select * into B from a where 1 <> 1 Description: copy a table (copy data, source table name: A target table name: B)Insert into B (a, B, c) Select D, E, F from B;

Note: copy a table (only copy structure, source table name: a new table name: B)Select * into B from a where 1 <> 1 Description: copy a table (copy data, source table name: A target table name: B)Insert into B (a, B, c) Select D, E, F from B;

Note: copy a table (only copy structure, source table name: a new table name: B)Select * into B from a where 1 <> 1 Description: copy a table (copy data, source table name: a target table name: B)Insert into B (a, B, c) select d, e, f from B;

Description: Copy table (copy only structure, source table name: A new table name: b)SELECT * into B from a where 1<>1 Description: Copy table (copy data, source table name: A target table name: b)Insert into B (A, B, c) select d,e,f from B;

1. Column and column Conversion The data structure of the original table (Here It Can Be A view V_AnswerList), as shown in: Write the stored procedure: Code highlighting produced by Actipro CodeHighlighter (freeware)http://www.CodeHighlighter.com/--

I. Basics 1. Description: Create a database Create Database database-name 2. Description: delete a database. Drop database dbname 3. Description: Back up SQL Server --- Create a device for the backup data Use master Exec sp_addumpdevice 'disk',

I. Basics 1. Description: Create a database Create Database database-name 2. Description: delete a database. Drop database dbname 3. Description: Back up SQL Server --- Create a device for the backup data Use master Exec sp_addumpdevice 'disk',

Note: copy a table (only copy structure, source table name: a new table name: B)Select * into B from a where 1 <> 1 Description: copy a table (copy data, source table name: A target table name: B)Insert into B (a, B, c) Select D, E, F from B;