sql update multiple columns

If mysql processes an index, it is updated. If there is no index, it is inserted (multiple columns of unique indexes). If there is no index, It is very common to insert the index, there are many similar articles on the Internet. Today I will talk about the problems and methods that may occur when the unique index is a unique index of multiple

When mysql processes a unique index, it updates the index. If it does not exist, it should be very common to insert the index. There are many similar articles on the Internet, today I will talk about the problems and methods that may occur when this unique index is a unique index for multiple columns. Method 1: use? INSERTINTO? ON... DUPLICATEKEYUPDATE...: The table is created as follows: C When mysql proce

Label:---restore content starts---[This afternoon to accept an emergency small task, is a set of record statistics, the chess game player's two records in a row of the display, into the database after the first thought is the row to the column, but at the beginning felt wrong, and later wrote half really wrong, later on the Internet query for half a day more than a row of rows and more columns, Found to write algorithms and write functions, see the re

Tags: SQL Server database list arraySometimes houyouxi may require multiple parameters when queried by the server, and the number of bits is not necessarily dynamic.This could be a condition for passing a list to SQL.----splitalistandreturnatableifids--Usedto takeacommaseparatedlistasastringandreturna table--createfunction[dbo]. [Splitidlist] ( @CommaSeparatedIDL

Label:Find the maximum value for multiple columns in one row in a SQL Server table Sometimes we need to find the largest value from multiple identical joins (the same data type for these columns) and show Here is an example IF(object_id('tempdb: # #TestTable') is not NULL)

Concatenate the values of multiple queried columns into a string bitsCN.com using SQL. Concatenate the values of multiple queried columns into a string using SQL. MySQL: [SQL]

Tags: http technology present tar comma Ace SEL Reference codeToday to change to the old man's code, actually put multiple IDs in a column, or use the comma partition ... What do you do when you inquire???Search the internet for half a day, finally found a SQL Server inside there is a parsename function, you can press. (dot) to split the string,So I wrote down the following SQLSELECT ParseName (REPLACE(from

when '2' Then 1.10 when '3' Then 1.15 Else 1.08End; quit;8: Change the columns in the tableTo add, drop (delete), or modify columns in a table, use the ALTER table St Atement. /* add column */ proc SQL; alter table work .payrollmaster4 add Bonus num format= comma10. 2 , level char (3 /* Delete Column */Proc

Label:Let's take a look at the example below: Table tables Field 1 Field 2 ID Name 1 A 2 b 3 C 4 C 5 b The library structure is probably like this, this is just a simple example, the actual situation will be much more complex. For example, if I want to use a single statement to find all the data that name does not repeat, then you must Use distinct to remove redundant duplicate records. The results from the select DISTINCT name from table are: ---------- Name AC It seems to be working, but what

Label:In writing SQL, we often encounter such a problem. Every time you insert, you have to judge whether the data table already exists in this data, the so-called same data, except the primary key all columns are the same, no insert, there is update. In this situation, we do not know whether this column exists, so the simple insertion and

Tags: exe code ima define BLE multi-column class statement DECLARE @c CHARACTER ( -)/* Declaration column */DECLARE @NUM INT/* declaration creates the specified number of rows */DECLARE @sql CHARACTER ( -)/* Declares the Execute SQL statement */SET @NUM=10/* Defined as 10 columns * /While (@NUM>0) BEGIN SET @c= CONVERT (CHARACTER (Ten), @NUM)/* Set column * /Set

In MySQL:[SQL] Viewplaincopyprint?--single-row stitching, first find a row, plus a comma, and then the next line of stitching isolatedSelectGroup_concat (E.support) fromENGINES EwhereE.xainch('YES','NO') --The results are as follows: Yes,yes,yes,yes,yes,yes,default,yes --replace the "," in the result of the query with the "* *" numberSelect REPLACE(Group_concat (E.support),',','**') fromENGINES EwhereE.xainch('YES','NO') --The results are as fo

Perform updates on a single table nothing more to say than to update table_name set col1 = Xx,col2 = yy where col = zz, which is mainly the setting of the Where condition. Sometimes updating a table may involve more than one datasheet, for example: The code is as follows Copy Code Update Table_1 Set score = score + 5 where UID in (select UID from table_2 where sid = 10);In fact,

SQL stored procedures update data through multiple IDs, SQL stored procedures The following is an example: I want to add 1 to the name of some brands (that is, Brand_Name), and Brand_ID is the primary key. The SQL statement is easy to implement. But how can I write the store

And MySQL in contrast to see: http://blog.csdn.net/rainyspring4540/article/details/50231435 This is the oracle10g environment. The database structure is as follows: If I want to show the same name on the same line, there are 2 basic shows: First presentation (displayed on different columns of the same row) Its SQL is as follows: Select Name, max (decode (type, ' math ', score,0) as math, max (de

When you execute an SQL query and UPDATE multiple rows of records, we usually use the following SQL statement to UPDATE the field value: 1 UPDATE mytable SET myfield = 'value' WHERE other_field = 'other _ value'; however, if you w

Execute an SQL statement update multiple records implementation ideasWhat would you do if you wanted to update multiple rows of data, and the values of each field in each row were different? This article takes an example to explain how to achieve the situation as shown in th

Execute an SQL query and UPDATE multiple rows to record bitsCN.com Execute an SQL query and UPDATE multiple rows of records Generally, the following SQL statement is used to

What would you do if you wanted to update multiple rows of data, and the values of each field in each row were different? This article takes an example to explain how to implement the situation as shown in the title, a friend with this need to understand under normal circumstances, we will use the following SQL statement to u