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.

learn more… | top users | synonyms

2
votes
2answers
4k views

How do I fix the definer problem The user specified as a definer ('fred'@'192.168.0.%') does not exist

I dumped an existing database from my web site into a new MySQL setup on my laptop. Everything works except pages that use a view, when the error message above appears. There is only one view on the ...
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 ...
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 ...
1
vote
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
3answers
691 views

Bulk update of all columns

I am wondering if PostgreSQL has an update query somewhat like their insert values syntax. I have an updated set of data in this form currently: INSERT INTO ...
1
vote
3answers
98 views

How to map similar camelcased, pascalcased, underscored, lowerscored words to the same id?

I'm working on PostgreSQL and I have a table like this called words_table: I need all equivalent words (like software_design and software-design) to have its map value = to its word's equivalent ...
1
vote
2answers
92 views

Is column order reliable in UPDATE?

Can we reply on the order of columns in an UPDATE? SET @x = 0 UPDATE table1 SET col1=IF(col1 IS NULL, NULL, @x:=@x+col1), col2=IF(col2 IS NULL, NULL, @x:=@x+col2), col3=IF(col3 IS NULL, NULL, @x:=0) ...
1
vote
2answers
98 views

Dynamic UPDATE fails due to unwanted parenthesis around string in plpgsql

Using PostgreSQL 9.3.4 on Mac OSX 10.9.2 with Postgres.app. I want to apply a function to all columns in a table, specifically I want to trim white space. So far I've got this in a file test.sql: ...
1
vote
1answer
84 views

numbering rows consecutively for a number of tables

I have a number of tables, all containing attributes aid,bid,cid, and xid of type integer, other attributes may differ. For every (given) table T, I would like to order the rows according to ...
1
vote
2answers
128 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 ...
1
vote
2answers
381 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
2answers
153 views

Install SP 3 on SQL Server 2008, where merge replication is running

I have a SQL Server 2008 and I should install Service Pack 3 for it. On my server there are several databases replicated, and mobile devices sync data via merge replication. Can problems occur, if I ...
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
94 views

Create constraint for stopping mass update to a table

I want to create a constraint so that if more than 5 rows in a table are getting updated with an UPDATE statement it should warn the user / block the query.
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
vote
2answers
433 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 ...
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
17 views

Postgres Update, limit 1

I have a postgres database which contains details on clusters of servers, such as server status (active, standby, etc). Active servers at any time may need to fail over to a standby, and I don't care ...
1
vote
1answer
63 views

How to support multiple updates in this trigger?

Below is the code of a trigger, basically it calls a function in case the record that is being updated does not have other row associated by it's Id in another table. In a multiple row update this ...
1
vote
1answer
110 views

Free space from image column after update

I'm doing some cleanup on one of our database for development purposes on a test server. There are a couple of tables with one IMAGE column. Both tables take roughly 50Gb of space, being the image ...
1
vote
2answers
926 views

SQL Update column with data from another table

I am working on complicated problem, but I will simplify it to this problem. I have two tables A [ID, column1, column2, column3] B [ID, column1, column2, column3, column4] and i want to update ...
1
vote
1answer
81 views

How to do two actions in conditional UPDATE?

In a query as SET @x = 1 UPDATE table1 SET col2 = IF(col1 = 'y', @x:=0, @x:=@x+1) Every time reaching the value of y in col1, I want to SET the @x:=@x+1 and after that reset the x to 0. In other ...
1
vote
1answer
585 views

UPDATE a column by COUNT of another table

It might be a naive question, but what is the difference of these two queries and which is preferred? UPDATE table1, (SELECT id,COUNT(*) idcount FROM table2 GROUP BY id) AS B SET table1.Freq = ...
1
vote
1answer
117 views

How to UPDATE a column by COUNT of FK from another table?

How to extend this query for the entire table, to update all ids? UPDATE table1 SET number=( SELECT COUNT(*) FROM table2 where id=1 ) WHERE id=1 id is the PRIMARY KEY in table1 and FK in table2. ...
1
vote
1answer
183 views

Mysql update different fileds set depend on condition

I have two tables "a" : CREATE TABLE `a` ( `id` int(11) NOT NULL AUTO_INCREMENT, `i1` int(11) DEFAULT NULL, `i2` int(11) DEFAULT NULL, `ib` int(11) DEFAULT NULL, KEY `id` (`id`) ) ...
1
vote
1answer
747 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 ...
1
vote
1answer
32 views

MYSQL - UPDATING multiple rows with different values in one query (for dummies)

I am trying to understand how to UPDATE multiple rows with different values and I just don't get it. The solution is everywhere but to me it looks difficult to understand. For instance, two updates ...
1
vote
2answers
65 views

how should i do this trigger?

I am a newbie to the sql world :) Right now i'm trying to create my first mysql trigger that would either update a row or insert a new one. Could you help me with that ? Here is the code : DELIMITER ...
1
vote
2answers
55 views

Oracle tables partition related

Here is my doubt. Is it possible to apply a partition to one table depending in the partitions values of another one? Why I am asking? I have one table where information headers are persisted, and ...
1
vote
1answer
158 views

How to use LOW_PRIORITY for heavy queries?

I have scheduled heavy UPDATE queries at administrator level, and since they are heavy UPDATEs with multiple JOINs, consume a huge amount of resources. I do not want them to stop end users from ...
1
vote
1answer
70 views

Set replica set member host names on Secondary

I have a replica set rset1 that consists of a primary, secondary, and a backup server. I recently just changed their DNS names in Route53--the only name that didn't change was the Primary's, ...
1
vote
2answers
118 views

MySQL (InnoDB) UPDATE SET performance with value in WHERE AND clause

If an UPDATE query is performed where the values being SET are also part of the WHERE clause, in the form of an additional AND statement on the column being set's value, is there a significant ...
1
vote
1answer
373 views

UPDATE SET REPLACE() matches but does not change

I've seen another post about this exact thing but it's 1-1/2 years old so I thought I'd make my own...besides, the other post did not help me. What I am trying to do is pretty straight-forward. To ...
1
vote
1answer
102 views

How to UPDATE a table for the level of parents in a column?

I have a table with internal parents as id parent parent_level 1 NULL 1 2 1 2 3 1 2 4 3 3 where parent has a FK to id. How can I update the table ...
1
vote
1answer
327 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 ...
1
vote
1answer
196 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 ...
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 ...
1
vote
1answer
239 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 ...
1
vote
1answer
287 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 ...
1
vote
1answer
24 views

How to update a single record in a table based of foriegn key ID in another table?

I am still very new to sql. I am having troubles updating one table. I am sending information from a web application into Microsoft SQL 2008 database. I have a table called EmployeePermissions that ...
1
vote
0answers
22 views

Compare While doing update [closed]

I have a to modify a Import job that checks values in an table that is only used for read operation and updates them if the Source has changed: Update mytable as Target Set c1 = Source.c1, c2 = ...
1
vote
1answer
61 views

Mysql sequential numbering based on MAX of another column

I've a table lp_pictures which have these fields: [id | plate_uid] [1 | aaa] [1 | aaa] [1 | aaa] [1 | bbb] [1 | bbb] [1 | bbb] and i need to UPDATE the field id to becomes: [id | plate_uid] ...
1
vote
1answer
2k views

Mysql: update query with subquery

Hello i need to perform the following query Query update Taxonomy set sourceId = ( select id from TaxonomyMapping a where a.oldId = ( select cm.en_ID from TaxonomyMapping ta ...
1
vote
1answer
467 views

Oracle 10g: Optimizing an update query that uses a subquery

I have the following query within a stored procedure, and I've been trying to improve its performance to no avail. UPDATE TBL_REPORTING REP SET (REP.ISSUER_ID, REP.ISSUER_NAME ) = ( ...
1
vote
0answers
184 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
84 views

scenario to update or insert big amount of data

I try to find the best scenario to update or insert 1 million contacts in my postgres database. My actual scenario is: read contacts 1000 per 1000 and try to insert multiple rows with one request ...
0
votes
2answers
3k 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 ...
0
votes
2answers
66 views

For SQL Server, What is the proper way to update a table?

I don't have a mentor to ask so I am seeking direction from the DBA community. I am in charge of a SQL SERVER 2008 R2 and SQL Azure databases that are the resources for a website and an ERP system for ...
0
votes
1answer
71 views

Performance on updating row

When updating in SQL Sever, it is my understanding that the entire row is deleted and then recreated (which is why you get a new timestamp). So then, if you update 1 field or 500 fields, does the ...
0
votes
2answers
943 views

Update year alone in date (Oracle 11g)

When I checked one of my client's database, I found some mistakes which will make problems. The problem is that the date is showing as 01-01-01 when I try to display it in the dd-MM-yyyy format the ...