UPDATE changes the values of the specified columns in all rows that satisfy the condition. Only the columns to be modified need be mentioned in the SET clause; columns not explicitly modified retain their previous values.

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2
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1answer
1k views

UPDATE table based on the same table

I have a table with product descriptions, and each product description has a product_id and a language_id. What I want to do is update all of the fields with a language_id of 2 to be equal to the same ...
-1
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3answers
113 views

Add Contents in a Column and make them 0 [closed]

http://sqlfiddle.com/#!3/96f11/3 In the above fiddle, I need the required output in the Fiddle. ie., The UserID column in Filtered Table and Main table are equal. I need to get the Amt column data ...
2
votes
1answer
140 views

Updating column in underlying table causes massive transaction log growth

I have an underlying table ~14k records and an indexed view that contains ~11 million records. When updating a column in the small underlying table this seems to cause a massive transaction log entry ...
0
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2answers
4k views

Use CASE to select columns in UPDATE query?

I can use CASE to choose which columns to display in a SELECT query (Postgres), like so: SELECT CASE WHEN val = 0 THEN column_x WHEN val = 1 THEN column_y ELSE 0 END AS ...
1
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3answers
152 views

How to handle update or insert situations

From time to time my stored procedures looks like create procedure handle_data @fk int ,@value varchar(10) as begin if exists (select * from my_table ...
1
vote
1answer
331 views

Is there a workaround for lack of support of cascade triggers with MySQL?

As things stand, cascaded foreign key actions do not activate triggers with MySQL. I don't want to get into the debate as to whether or not this is good, I just would like to know whether there is a ...
0
votes
1answer
112 views

MySQL-5.1 is not updating some rows with a simple UPDATE query [closed]

I'm trying to update a column in a table to be the same as the contents in the column of another table as part of a de-normalization process for a data warehouse project. The data is confidential, so ...
0
votes
1answer
2k views

update column based on the sort order of another query

I'm trying to add arbitrarily ordered records to a database so that they can be sorted by the ui (or when I query the database ). My problem is I already have the list, and I need to add a default ...
0
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1answer
77 views

Comparing two tables for a UUID change and fix it

I have two tables which I'm trying to reconcile the differences of in postgresql. Table A is old and needs updating. Table B is an updated, schema identical version of Table A which I have the data ...
2
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0answers
147 views

How to execute a non-table-locking update operation on PostgreSQL? [closed]

Looking for a good way to update the value on a column for all the rows in a database (not huge, but big enough - about 10M records), without locking the whole table, so operations can continue while ...
0
votes
1answer
105 views

MySQL UPDATE statement using a table created on the fly

I want to update a table, say Table 1 using a table that I create on the fly (saytemp). To achieve this I have the following query: UPDATE Table1 SET COUNT = temp.ctemp FROM ( SELECT A, SUM(UNO) AS ...
3
votes
1answer
2k views

Oracle: Non key-preserved table should be

I'm getting "ORA-01779: cannot modify a column which maps to a non key-preserved table" when I try to update a join. I've searched around the site and found a lot of advice on what key-preserved ...
0
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0answers
81 views

mysql table not updating no errors

i am using mysql 5.2.44 CE revision 9933 i have a table in which i am trying to update a few columns of the rows i am not using queries, just doing it using the edit table UI provided in the ...
2
votes
2answers
432 views

DB2 UPDATE TRIGGER

I am trying to create a trigger in a DB2 database that runs on the update of a column in one table, and then fills in another table with certain values. For example, there is a power unit table with ...
0
votes
2answers
1k views

how to set a row's value from a certain row's value?

I have a MySQL table named "activities" with fields id(int), tstamp(timestamp), amount(decimal) balance(decimal). Decimal fields hold money values. id tstamp amount balance ...
1
vote
1answer
200 views

Update field1.table1 based on compound join between table1 and table2 - Oracle

I want to run update statement on Oracle 11g, but it fails with the following error: SQL Error: ORA-01427: single-row subquery returns more than one row 01427. 00000 - "single-row subquery ...
2
votes
1answer
233 views

Apply in a CSV file to multiple databases

Recently, I have been working with a client whom has asked us to provide their dataset for use in a mobile application we are making for them. The requirements for this project include the ability to ...
2
votes
2answers
171 views

Help with tricky update statement

I've tried writting this update statement every possible way I can think of but I either wind up producing invalid results or run into a syntax barrier. I have two table variables: DECLARE ...
1
vote
2answers
129 views

How does optimistic locking actually enforce re-read/update?

My understanding of optimistic locking is that it uses a timestamp on each record in a table to determine the "version" of the record, so that when the record is access by multiple processes at the ...
3
votes
2answers
420 views

Should I use select count(*) for counting records or having a field like comments_no for tables like post, comments?

In my recent project which is about social networking for an Asian country, I'm in doubt whether I use the below SQL statement for counting records: SELECT COUNT(id) shareLikeNo FROM ...
2
votes
1answer
1k views

Update to session table slow

I have a number of websites with session tables on a web server, these are used by Joomla CMS and Symfony framework systems. With slow_query_log=0.6, the update queries for the session tables come up ...
1
vote
2answers
443 views

Would existing constraints and indexes applied to an old table, apply to a new table renamed like the old one after it's dropped?

everything is in the question. I have a table named tableA on which we have indexes and foreign keys and constraints. I have to modify content in a column called column1. This being a production ...
2
votes
3answers
656 views

Problem with nested UPDATE queries

I cannot make an update query work. As a first step, the following one works correctly: UPDATE Tab1 SET Tab1.a = '3' WHERE Tab1.id IN ( 123, 456 ); where id is the primary key of Tab1. ...
1
vote
1answer
62 views

Is it a good idea to have an index when the column value changes several times over record lifetime?

I have a table where one of the columns represents an object state - let it be State of type int. The State value starts with 1 and changes to 7 with values in between. Over a row lifetime there're ...
1
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0answers
189 views

Best Practice to update columnstore indexed tables

I have a table with aprox. 22 Bn rows, for each month I have made one partition that and each partition has two data files. I created the columnstore index on this table and the performance ...
1
vote
1answer
267 views

How to re-arrange rows to best fit within groups?

I categorized a table with the method introduced here to categorize my items to folders with a limit size of 100. mixing_order id num_items cat order_in_cat cumulative_sum folder 1 ...
2
votes
1answer
1k views

How to re-assign two variables in a conditional UPDATE

Consider a simple update as SET @var1 = 20; SET @var2 = 26; UPDATE table1 SET col1=IF(@var1>50, @var1 := @var1-col4, @var1 := @var1+col5), col2=IF(@var2>50, @var2 := @var2-col6, @var2); ...
0
votes
1answer
972 views

How to UPDATE a column to SET previous row value to NULL cells?

I have a table as id value 1 music 2 3 movie 4 5 6 book 7 8 Some values are missing, and I want to assign the value of previous row to produce id value 1 music 2 music 3 movie 4 ...
1
vote
4answers
472 views

Performance degradation while updating tables having 10s of millions of records

I want to update tables ( my be 20-30 ) having 10s of millions of records each. The problem is that it is taking too much time for the update process and also at that time CPU usage also goes very ...
3
votes
1answer
445 views

A function to check if a column allows NULL

Is there a way to write an insert/update query that checks if a column allows NULLs: If it does set the column to NULL, and '' (empty string) otherwise? I would be something like: UPDATE mytable ...
3
votes
3answers
1k views

Update field with new string made from characters in existing value

field is meta_value and current value is like 01/01/2006 i want to change it to a string 20060101 so thought i could get the value and update it with the characters in the correct order. ie UPDATE ...
2
votes
1answer
1k views

I have to update all the rows of a Column in a table. Here is my query

So My tables are People: People_name(VARCHAR 100), People_id (INT, PRIMARY KEY AUTO INCREMENT) Tracks: Track_id(INT PRIMARY KEY), People_id_references (int ,Foreign key references ...
2
votes
1answer
445 views

Update ranking on table

I have two tables: mysql> desc rank ; +----------------+-------------+------+-----+---------+----------------+ | Field | Type | Null | Key | Default | Extra | ...
2
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2answers
3k views

GROUP BY two columns

I want to count two columns, but need to get the results of first column in one row. SELECT country, COUNT(*) FROM table1 GROUP BY country, type This query gives me country type COUNT(*) ...
3
votes
2answers
622 views

postgreSQL update set only where cast is possible and ignore error?

I have 2 columns in a PostgreSQL table. The mac_address_temp column is for migration from character type to MAC-address type: mac_address | macaddr | mac_address_temp | character ...
1
vote
1answer
759 views

How should I update ID field values for all records based on previous values?

I need a SQL query that can update ID fields for all records in a table from their previous values to a new value based on that previous value. For example, if the ID is 1, I want to change it to ...
4
votes
2answers
5k views

Updating Multiple Rows with Data from Column A into Column B?

I have about 60,000 rows that I'm needing to update the information from column_a to column_b. For example, 60,000 customers need their arrival_time to match their departure_time. I understand that ...
2
votes
1answer
1k views

SQL Select WHERE row updated

USE [RF_WORLD] GO /****** Object: Trigger [dbo].[lastdeathtrigg] Script Date: 08/20/2012 10:52:58 ******/ SET ANSI_NULLS ON GO SET QUOTED_IDENTIFIER ON GO -- ...
7
votes
1answer
1k views

Direct the OUTPUT of an UPDATE statement to a local variable

I would like to do this : DECLARE @Id INT; UPDATE Logins SET SomeField = 'some value' OUTPUT @Id = Id WHERE EmailAddress = @EmailAddress -- this is a parameter of the sproc Is this even ...
0
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0answers
99 views

Being careful about additional records being added in a duplicate record merge?

We have a multi-user MS-Access 2003 database. Connecting to it using SQuirrel SQL, and the JDBC/ODBC bridge, I've managed to eek transactions of some sort out of JET by turning off autocommit. I've ...
4
votes
2answers
267 views

fast bulk incrementing in MySQL

I have one big table foobar describing a many-to-many-relation and containing millions of foo's, millions of bar's and every bar having several hundereds of foo's -> billions of rows. CREATE TABLE ...
1
vote
1answer
1k views

Why I cannot let EXPLAIN update statements?

I can imagine that it's actually more important to explain SELECT statements, but I wonder why there's no possibility to use EXPLAIN on UPDATEs/INSERTs. I may use a WHERE-statement in an UPDATE where ...
1
vote
1answer
242 views

extremely slow MyISAM slave updates

I have 2 slaves and one is working as expected. The other slave is extermely slow while executing the "update" statements. The insert and deletes are fast. I used "check table tbl_name" to see if any ...
0
votes
1answer
137 views

Updating a table based on condition

I have a database having a staging_table. From this table, entries are added to other table named Profile. Whenever staging_table is updated, it checks whether all its entries are present in Profile, ...
6
votes
1answer
7k views

Trigger to UPDATE after UPDATE?

I want to make a trigger to record the time of any update as CREATE TRIGGER col_update AFTER UPDATE ON col FOR EACH ROW BEGIN UPDATE col SET updated=NOW() WHERE id=NEW.id; // or OLD.id END The ...
3
votes
1answer
668 views

Update rank on a large table

I have a mysql table that has now 12 million records and I'm trying to update a column (rank) with the following UPDATE code: SET @r=0; UPDATE records SET rank= @r:= (@r+1) where type = 2 ORDER BY ...
1
vote
2answers
390 views

Way to update many (>3000) records with unique data, using a character limited web form

Okay, as you can probably tell from the last part of the title, this is a non-ideal situation. I'm using a piece of industry-specific web-interface software that I guarantee no one has ever heard of, ...
1
vote
1answer
1k views

Find last (max) value according to TimeStamp using update method

I have task to find values of integer according to last (max) of timestamp (datetime) value. Because it is so complicated query I am consindering this way to find last value something like this ...
1
vote
1answer
289 views

What can cause an UPDATE statement to execute endless? [closed]

I have a stored-procedure which is executed at 7 o'clock in the morning that updates the database because new records were imported at night. Today it started but never endet. So i've tried to run ...
3
votes
1answer
288 views

See actual results of SQL UPDATE command

Is there a way to get the actual results of SQL UPDATE command (ie the table rows themselves), not just get the number of rows (other than by converting the UPDATE command to a SELECT)? I'm using ...