sql update multiple rows

up for the update operation. We know that the RID is used to identify the data page data row. When a row of data in the data page is updated so that the existing data page cannot accommodate this row, SQLSERVER moves the row to a new data page. The original data row location is not occupied by other data rows, but replaced with a forwarding pointer. This pointer Points to the new location of the updated da

Because the project requires that multiple different records be updated at the same time, we have discussed a good solution with our colleagues. The following is a test example. 1. Create two temporary tables and input test data:View code 1 create table #temptest1 2 ( 3 id int, 4 name1 varchar(50), 5 age int 6 ) 7 8 create table #temptest2 9 (10 id int,11 name1 varchar(50),12 age int13 ) The following table data is queried:

1. @ Error If an error occurs in the current statement, the error code is returned. Otherwise, 0 is returned. Note that @ error is reset immediately after each statement is executed. Therefore, check the value after the statement to be verified is executed or save it to a local variable for future use. For detailed analysis, see the following code. Update af_carinfo set carinfoid = 19 Where oilcost = 13 -- after execution @ error is 547 Print @ error

SQL Application and Development: (5) connecting multiple data tables and multiple SQL tables Different tables in the database store different data. Users often need to use the data in multiple tables to combine and extract the required information. If a query needs to operat

;echo "";echo $mysqli->affected_rows; The database has been connected successfully. After the above code is executedecho $resultIf the output is 1, the operation is successful,echo $mysqli->affected_rowsIf the output is 0, it indicates a failure. How can this problem be solved ???? Tip: If you execute an update statement for a record on the mysql client, you can continue the update in php and the

Original article: http://support.microsoft.com/kb/139444/SummaryThe Microsoft SQL Server table should not contain duplicate rows and non-unique primary keys. For the sake of conciseness, we sometimes refer to the primary key as "key" or "Pk" in this article, but this always indicates "primary key ". Repeated PK violates entity integrity and is not allowed in the relational system.

Mysql update modifies multiple data entries and mysql updatesGenerally, the following SQL statement is used to update the field value:Copy codeThe Code is as follows:UPDATE mytable SET myfield = 'value' WHERE other_field = 'other _ value ';However, what if you want to update

. Demo: _ Variant_t vrecordsaffected; Try{M_pconnection-> execute (_ bstr_t (ssql), vrecordsaffected, ad1_text );} Vrecordsaffected --- indicates the number of affected rows of the current SQL statement. However, a problem occurs in the project. If a table has a trigger, and the trigger does not succeed every time (such as update ), When an insert statement i

be accomplished with a little bit of skill. Copy Code code as follows: UPDATE mytable SET myfield = case ID When 1 THEN ' value ' When 2 THEN ' value ' When 3 THEN ' value ' End WHERE ID in (1,2,3) This is a small trick to implement batch updates using the case.As an example: Copy Code code as follows: UPDATE Categories SET Display_order = case ID

In Oracle, the number of affected rows returned is: If Sql%rowcountExample: Update Ut_calenderstatus T set T.CALENDERSTATUS=PI_FLG, t.m=pi_m, t.n=pi_n, T.prolong=pi_prolong where T.fundcode=pi_fundcode; If Sql%rowcount=0 then inserts into Ut_calenderstatus va

Label:Global variables @ @RowCount and function rowcount_big () are used to return the number of rows affected by the previous statement. ROWCOUNT_BIG." data-guid="df6e979fe91e453fbe7eeeba1ae04611"> If the number of rows is greater than 2 billion, you need to use Rowcount_big (). 1,rowcount_big (): Following a SELECT statement, this function returns the number of

PHPCMS v9 get label SQL statement limit invalid and num and rows properties invalid problem so far it has been an old problem, the network also has some surface solutions, but the daily did not find from the bottom, layer template tag parsing and template engine code to really solve the problem of the method and explanation. Today, when using the GET tag SQL stat

straightforward way to implement batch updates, but it can be accomplished with a little bit of skill. 1 2 3 4 5 6 7 UPDATEmytable SETmyfield = CASEid WHEN1 THEN‘value‘ WHEN2 THEN‘value‘ WHEN3 THEN‘value‘ END WHEREid IN (1,2,3) This is a small trick to implement a batch update.As an example: 1 2 3 4 5 6 7 UPDATEcategories SETdisplay_order = CASEid WHEN1 THEN3 WHEN2 THEN4 WHEN3 THEN5 END WHEREid IN (1,2,3) This

ASP tutorial How to accept SQL return a select affected number of rows in. NET C # ' Instance two OleDbCommand command = new OleDbCommand (select COUNT (*) from Biao where Name= "John", Conn);OleDbDataReader reader = command. ExecuteReader ();if (reader. Read ()){strvalue = (string) reader. GetValue (0);} Reader. Close (); ' Instance two public static DataSet Query (string sqlstring){usi

For repeated row deletion problems, it is difficult to find a suitable answer on the Internet and there are a lot of questions, but there is no solution to the previous record in the search engine. In fact, this problem can be effectively solved. 1. If the table does not have a primary key (or the same row does not have different content columns), you need to create an auto-increment column to distinguish different columns. For example Copy codeThe Code is as follows: alter table [tablename]

For repeated row deletion problems, it is difficult to find a suitable answer on the Internet and there are a lot of questions, but there is no solution to the previous record in the search engine.In fact, this problem can be effectively solved.1. If the table does not have a primary key (or the same row does not have different content columns), you need to create an auto-increment column to distinguish different columns. For exampleCopy codeThe Code is as follows:Alter table [tablename] add [TI

[PK] --Method 2: Select A.* from Zy_bho a join zy_bho b On (A.[PK]--Method 3: SELECT * FROM Zy_bbo where zyh (select Zyh from Zy_bbo GROUP by Zyh having Count (zyh) >1) -where PK is a primary key or a unique field. To turn multiple rows of SQL data into a multiple-column data, a new column Cop

In sqlserver, the number of affected rows returned is: If @ rowcount In Oracle, the number of affected rows returned is: If SQL % rowcount Example: Sqlserver: Asbeginupdate t_mt set stat = @ stat, ostat = @ stat, rpttime = getdate () where msgid = @ msgidif @ rowcount ORACLE: Create or replace procedure testasbegin u