sql update multiple columns

deletion operations to prevent accidental deletion. Ii. Transaction Processing for data table operations, it is obvious that queries are more secure than update operations, because update operations may encounter errors, as a result, the update operation is not completed correctly according to the established requirements. However, in many cases,

Tags: null union PNG IMA entity begin Col Font spanOriginal: T-SQL rows merged into columns and columns split rows The source of this article: http://www.cnblogs.com/wy123/p/6910468.html I feel the recent SQL has not written less, suddenly a little rusty, for use is not too frequent some operations, time is easy to l

Traverse all tables in the database and update the values of datetime columns. Declare @ tablename nvarchar (80) declare @ cloumn nvarchar (80) declare @ SQL nvarchar (400) declare c1 cursor scroll forselect table_name, column_name from information_schema.columns where DATA_TYPE = 'datetime' open c1fetch first from c1 into @ tablename, @ cloumnwhile @ fetch_stat

); Org.apache.poi.ss.usermodel.Sheet Sheet= Workbook.getsheetat (1); Org.apache.poi.ss.usermodel.Row Row=NULL; Org.apache.poi.ss.usermodel.Cell Cell=NULL; if(Itemsegcount > 0) {Itemsegiter.setrangestart (0); Itemsegiter.setrangesize (Itemsegcount); for(inti = 0; i ) {Itemsegrow=Itemsegiter.getrowatrangeindex (i); String ItemDescription=(String) Itemsegrow.getattribute ("Description"); String ItemNumber=(String) Itemsegrow.getattribute ("ItemNumber"); Row=Sheet.createrow (i); Cell

MySQL index usage instructions (single-column index and multi-column index), mysql multiple columns 1. Single Column Index In the performance optimization process, selecting the columns to create an index is one of the most important steps. You can consider using two types of indexes: columns that appear in the Where c

Nested tables use Multiset union, Multiset except T, Multiset intersect, and other set operators. Generally, only one column is compared, but multiple columns are actually allowed: The following describes how to use the Multiset transform t operator. I. Use the set operator when there is only one column The following 1,), 2), 3), 4) indicates that when only one column is used, the set operator can be direc

(79.25) for all evenly divided: Second, the sub-query of the basic types of multi-column subquery Dolez query to return multiple columns. For example: query which employee's salary is the highest in any position. Sql>selecte mpno, ename, Sal, job from EMP where (SAL, Job) in (select Max (SAL), job from EMP Group by Job); Summary A single-row subquery is a

In 12C, multiple indexes can be created on the same set of columns, but the types of multiple indexes are different. At the same moment, only one is visible. as Select from EMP; SQL> CREATE INDEX emp_tab_ix_01 on Emp_tab (job,hiredate); -- before creating another index, change the index created in the previous step to

Ref: Http://forums.aspfree.com/net-development-11/displaying-multiple-columns-in-a-html-listbos-control-in-asp-19062.html ListBox column spacing Solution Finally !!! I know so far people have had this problem. But finally I solved it with your basic mono spacing font type. As we all know the Asp.net ListBox has a problem with truncating all added spaces. so you can't create

evaluation ', MAX (if (course= ' language ', familyevaluate,null)) As ' family evaluation ', MAX (if (course= ' language ', societyevaluate,null)) as ' social assessment ', max (if (course= ' English ', score,0)) as ' English ', Max (if ( Course= ' English ', bossevaluate,null) as ' principal evaluation ', MAX (if (course= ' English ', familyevaluate,null)) as ' family Assessment ', Max (if (course= ' English ', Societyevaluate,null) as ' social assessment ' from ds_wjytest2.student Group by na

The first, directly write the sub-column ID, with Cat in{pc:get sql= "select * from V9_news where status=99 and CatID in (21,22,23,24,25) Order by ID DESC" num= "7" return= "Data"} {Loop $data $r} The benefits of this approach: You can customize the column you want to takeDisadvantage: To write more than one ID, the background added to the column, the ID will be written inThe second, according to the parent column ID, such as the above 21,22,23,24,25

? MySQL does not provide a straightforward way to implement batch updates, but it can be accomplished with a little bit of skill. 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 (All-in-a- This is a small trick to implement a batch update. As an example: code as follows:

View the database version: Select * from V $ version; 1 Oracle Database 11g Enterprise Edition Release 11.1.0.7.0-64bit Production2PL/SQL release 11.1.0.7.0-Production3 "core11.1.0.7.0production"4tns for Linux: Version 11.1.0.7.0-Production5 nlsrtl version 11.1.0.7.0-Production ------------------ You can execute owminst. PLB to create Ceate wmsys and related objests$ ORACLE_HOME/rdbms/admin/owminst. PLB The method is as follows: Http://www.

Then ' value 'When 2 Then ' value 'When 3 Then ' value 'ENDWHERE ID in (All-in-a- This is a small trick to implement a batch update.As an example: The code is as follows:UPDATE CategoriesSET Display_order = case IDWhen 1 then 3When 2 then 4When 3 then 5ENDWHERE ID in (All-in-a- This SQL means, update the Display_order field, if id=1 the value of Display_order is 3, if id=2 Display_order value is 4, if id=3

Implementation of different values for mysql batch update and batch update of multiple records bitsCN.com Batch update The mysql update statement is simple. to update a field of a piece of data, write as follows:

the data is updated, and the WHERE clause ensures that only 3 rows of data are executed. If you update multiple values, you need to modify them only slightly: The code is as follows UPDATE Categories SET Display_order = case ID When 1 THEN 3 When 2 THEN 4 When 3 THEN 5 End, title = case ID When 1 THEN ' New Title

Batch update The mysql update statement is simple. to update a field of a piece of data, write as follows: Copy codeThe Code is as follows:UPDATE mytable SET myfield = 'value' WHERE other_field = 'other _ value '; If the same field is updated to the same value, mysql is also very simple. modify where: Copy codeThe Code is as follows:UPDATE mytable SET myfield = '

Http://www.cnblogs.com/gaizai/archive/2010/01/11/1644358.html Before I start, I want to talk about several concepts. Overwrite Query] When an index contains all the columns referenced by a query, it is usually called "Overwrite query ". [Index coverage] If the returned data column is included in the index's key value, or included in the index's key value + clustered index's key value, no bookup lookup occurs because the index item is found, the requ

SQL Update multi-table joint Update method, sqlupdate joint Update Sometimes we need to update the data in multiple tables at the same time, then we need to use the following method: (1) sqlite multi-Table

The following is a test example. 1. First create two temporary tables and input test data: Copy Code code as follows: CREATE TABLE #temptest1 ( ID int, name1 varchar (50), Age int ) CREATE TABLE #temptest2 ( ID int, name1 varchar (50), Age int ) The table data at this point in the query is: #temptest1 #temptest2 2. It is now time to update the age in the #temptest2 to the corresponding #temptest1.