sql update multiple columns

To highlight more important topics in database operations, the following is pinned. Guidelines for updating and deleting data : Do not use the WHERE clause when performing an update or delete, unless you really intend to update or delete each row. Make sure that each table has a primary key, and that it is used whenever possible to use a WHERE clause. Before using an

1. Create a test tableCreate table t_user (ID int identity primary key,UserID varchar (50) not null,UserName varchar (50) null,DeptID int not null,Phone varchar (50) null,Fax varchar (50) null) Create table t_dept (ID int identity primary key,DeptName varchar (50) null,Phone varchar (50) null,Fax varchar (50) null) INSERT t_userSelect n '001', N 'zhang san', 1, N '000000', N '000000'UNIONAll select n '002 ', N 'Li si', 2, N '000000', N '000000'UNIONAll select n '003 ', N 'wang wu', 2, N '000000'

-many connection statement Of course the above two tables are one-to-one, so if Table A and table B are one-to-many, One-to-many, or many-to-many, how do we write connected SQL statements? In fact, two more than a pair of SQL statements and one-to-one SQL statements are similar, but the results of the query is not the same, of course, the two tables are slightly

Tags: style blog io ar os using SP java forThe technical points for executing multiple SQL at a time are as follows: DatabaseMetaData interface is to describe the overall comprehensive information about the database, because DatabaseMetaData is an interface, so there is no construction method, so you cannot use new to create the DatabaseMetaData object, However, it can be created by connection's Ge

Note: The update operation, first gets the object, after the modification operation, directly calls the SubmitChanges () method to commit. Note that this is in the same DataContext, for the different Datacontex see the following explanation.1. Simple FormCustomer cust = "ALFKI""Vice President" ;d B. SubmitChanges ();Statement Description: Use SubmitChanges to persist the updates made to the retrieved one customer object back to the database.2.

(@I_WHILE_XUEHAO >=6080 and @I_WHILE_XUEHAO Data for the "Composite score Table": 3.1.1. Create a view associated with 3 tables: Use [Sql-li] go CREATE VIEW shitu_ffenshu_xinxi (name, student number, average score, total score, class, birth date ) as SELECT top X. Name, F. School Number, Z. Average score, Z. Total Score, X. class, X. Date of birth from[dbo]. Xinxin_tab as X INNER JOIN [DBO]. Fenshu_tab as F on X. School number =f.

Label:PL/SQL Developer manages multiple sets of databases and connects multiple sets of databases as a unified interface platform. 1.. 1, class SQL Plus Windows: File->new->command window, this is similar to Oracle's client tool SQL Plus, but it is much more useful. 2, set

Tags: manipulating style max snippet multiple statement results one SouthOriginal: SQL Server updatable subscription Queue Reader Agent error: An attempted insert or update has failedToday it is found that the Queue Reader Agent keeps trying to start but always goes wrong:The contents are as follows:This may be caused by another problem that has just been dealt w

1. Import table in the same format as the two tables, import data from one table into another table.There are now two records in the Person_old table. Next, insert all the records from the Person_old table into the person table, with the following statement:INSERT into person (id,name,age,info)SELECT Id,name,age,info from Person_old;2. "Modify multiple rows of data"In the person table, update the records wi

Tags: inserting data static not for bin end scene Targe info exceptSceneWhen an order is placed, an order and multiple order details are generated, that is, an order object and multiple OrderInfo objects. When multiple OrderInfo objects are in the library, the DAO layer is called to the upper layer, and the interface entry is LIST Such as: Insert into Values ('1