sql server update table from another table

Reproduced: Original: http://blog.csdn.net/jcx5083761/article/details/260107631. Easy to writing, high efficiency of update:Update table1Set Field1=table2.field1,Field2=table2.field2From table2where table1.id=table2.id2. Conventional way, the kind of writing is equivalent to a left join, in the outside where is the number of updates, if not add where is all recordsUpdate table1Set field1= (select top 1 field1 from table2 where table2.id=table1.id)where table1.id in (condition)Between two tables

Suppose there is table name Icate_table_set (table_id,table_name,table_state_id,store_id), table name Icate_table_state (state_id,state_ Name,state_attr status attributes such as empty tables, using Medium, store_id)Store_id assume that the state name of each branch of the store ID may be different but the property is the sameNow we have to change all tables to correspond as empty

I have two tables, all of which are mobile phone numbers. Table A contains Table B. The col001 columns of both tables are mobile phone numbers, Table B of column col002 is a number and table A is 0. To compare the two tables, as long as the mobile phone number of Table B in

Code Create Database T Create Table A(ID Int ,Username Nvarchar ( 50 )) Create Table B(ID Int ,Userdisplayname Nvarchar ( 50 )) Insert Into A Values ( 1 , ' User1 ' ); Insert Into A Values ( 2 , ' User2 ' ); Insert Into A Values ( 3 , ' User3 ' ); Insert Into B Values ( 1 , ' Display1 ' ); Insert Into B Values ( 2

temporary tables or other methods that pass parameter lists. Table-valued parameters have the following advantages: Locks are not acquired when data is first populated from the client. Provides a simple programming model. Allows complex business logic to be included in a single routine. Reduce the round-trip to the server. A table struct

Problem Description:Two Tables A and B, each with a field, update time A.MODIFIED_TM and B.modified_tm,a table as the main table, update time is not empty, but the B table update time may be empty, now to take a, B two

Difference between SQL Server table variables and temporary tables (Supplement), SQL Server I. Table Variables Table variables are introduced in SQ