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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65 views

SQL Timeout when updating specific rows that goes away when other columns are updated

The data I'm going to provide won't be very complete, so I apologize in advance for that, and will happily supplement with more on request. I mostly just don't know where to begin looking, and don't ...
2
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1answer
90 views

Updating a table which contains an Image datatype column

I have a table which contains a few columns, one of which is an image datatype, this is used to store BLOB data, which could be anything from a jpg to a large PDF. I have a requirement to update one ...
3
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1answer
81 views

In a WordPress/WooCommerce table the prices are hosed. How to realign them? (a key=value structure)

We had in our WordPress/Woocommerce table (hence mySQL) ab_postmeta the sale (discount) prices for some products. We thought that reseting the sale prices via SQL query (and not via WordPress ...
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3answers
43 views

MongoDB multi update consistency

I have a collection similar to the below, of say 5,000,000 records. { "_id" : ObjectId("56d18f95d2961d1ddcb7244f"), "rec_id" : 0, "status" : "open", "updated by" : "A" } User B is trying ...
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0answers
37 views

Manual postgres migration for Django (python) app

I have a Django (python) data model called Message: class Message(models.Model): text = models.CharField(max_length=50) sending_time = models.DateTimeField(auto_now_add=True) I added sender ...
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2answers
67 views

Update function to enter random/unique GUID per row

I am new to SQL and am trying to do the following. i am using SQLite browser to edit the current file I have I do have a SQLite database with around 1500 rows of data that I would like to create a ...
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0answers
40 views

Updating 2M rows based on 2M individual rules (MYSQL)

I'm carrying out a fairly simple (but large) Database combine/migration (simple/dumb, but slow work). It's 2 systems that are very similar, but do have slight differences. Currently the main issue is ...
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1answer
16k views

Update all columns from another table

I need to update a table from another one, and I need to update all columns. Besides listing every column in the SET clause, is there a way to update them all at once? Like this: update tableA set * ...
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1answer
44 views

mysql update based on select result

Here are two SQL statements. One is an update statement and the other is a select statement. I want to combine them. Update update customer_entity set website_id = 4 where website_id = 3 Select ...
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1answer
39 views

Select and update specific mysql data in single query

I am trying to first select data from a row which contains certain characters. I would then like to update and append new data into another row of those items that were selected. This is my current ...
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4answers
3k views

ISNULL() OR Is NULL in UPDATE statement

I have to run an UPDATE statement on live online database with about 5 lac records. I want to know which statement will run faster: Update Table set REC_ID = isnull(REC_ID,'') Update Table set ...
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32 views

MySQL Update column with case on joined tables

I have 2 tables and I want to update table 1 using a case check on table 2: update cms.Clients c #c_id unique join cms.ClientDomains d #c_id not unique on c.c_id = d.c_id set c.country = case ...
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1answer
15 views

Access IFf Query

I'm new and just starting out at creating databases so I apologise if noob question. What I am trying to do is update my Staff table to show that "Sarah Avon" has married and her new last name is ...
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0answers
52 views

oracle update statement is too slow

I have oracle database 11.2.0.4 on oracle linux 6.4 I have configure huge page on this OS . After 5 months of my projects , when i want to update any tables their have over 20,000,000 records , this ...
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4answers
783 views

Does updating a row with the same value actually update the row?

I have a performance-related question. Let's say I have a user with first name Michael. Take the following query: UPDATE users SET first_name = 'Michael' WHERE users.id = 123 Will the query ...
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2answers
75 views

Updating duplicate records with different data

I have a migration specific issue. Data from a large table has been migrated into another table, but data for one destination column is missing due to certain issues (that are not specific to this ...
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1answer
4k 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 ...
6
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3answers
262 views

Updating a view on multiple joined tables

Since MSDN does not say much, what happens exactly if I execute the following query? update claims set status='Awaiting Auth.' where status = 'Approved' Can I use the ClaimStatusName column of the ...
3
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1answer
582 views

Change SELECT DISTINCT to UPDATE DISTINCT

How can I modify my SELECT DISTINCT query to an UPDATE DISTINCT query? It is important that it only updates the distinct records, as there are multiple records associated with each ...
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1answer
66 views

Prepare MySQL for big UPDATE query on production server

Surprisingly I have not found anything relevant on this subject. What are best practices to prepare production MySQL server for a big update query? The question is broad but I'd like to know details ...
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0answers
41 views

Copy data from one table to another

I have a table named cameraInfo and another named macTable. Both tables have a column for mac address and password. Not all the mac address in macTable are in the cameraInfo table. However, if the mac ...
11
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2answers
166 views

PostgreSQL Recursive Descendant Depth

I need to calculate the depth of a descendant from it's ancestor. When a record has object_id = parent_id = ancestor_id, it is considered a root node (the ancestor). I have been trying to get a WITH ...
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1answer
42 views

MySQL Trigger to Update a Row in a Separate Table via Joins if Only One Row is Updated

I am trying to create a trigger so that when a column in a table called bookings is updated it will update a a calculated price value in table departments. I currently have my tables set up as so ...
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1answer
30 views

Update all rows when sort/ordering value is changed for single row?

I am in the process of creating a GIS application with multiple layers and many pieces of content shapes on each layer. Currently each layer/shape is drawn in the order that it was returned from the ...
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2answers
55 views

Using a query in an update

I have a query which generates a result set (key, a, b). I want to use an update statement where, for each entry in a table with Tkey = key, set ColA = a, ColB = b. How would I do this? Right now ...
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1answer
105 views

MySQL Using a trigger to update quantity on another table if part is used

I am new to triggers but want to know how I can use one in my database. I have created a table for a maintenance log, a parts inventory, and a parts_used junction table. When maintenance is carried ...
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2answers
626 views

$addToset do not work in update if record not exists [closed]

I am trying to use following query db.TestColl.update({ "tags" : "silk" , "host" : "host.com"},{ "$set" : { "cat" : "MOVIE" , "$addToSet" : { "articleId" : { "$each" : [ "20442242"]}} , ...
3
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1answer
51 views

Update a column, selected by query

Just stumbled upon this stackoverflow question: http://stackoverflow.com/questions/13648898/sql-update-with-row-number. The second answer struck me as odd: UPDATE x SET x.CODE_DEST = x.New_CODE_DEST ...
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2answers
781 views

Effect of an index on update statements where update column is not in an index

I constantly see people say that indexes slow down update, delete and insert. This is used as a blanket statement, as if it is an absolute. While tuning my database to improve performance, I keep ...
1
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1answer
193 views

Trigger on a Schema

Is it possible to create a Trigger on a Schema? I have to audit the changes on my tables. But I have a lot of tables and I don't one to create a trigger on them one by one. --Database level trigger. ...
8
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6answers
721 views

Switching values in a column with one update statement

You find that an error in a system has been incorrectly naming men (M) as women (W) and vice versa in the database. The columns only allows for one character. Without using any temp tables, write one ...
0
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1answer
109 views

update statements shows update count but not updating the table

I am facing a strange issue which I have never faced before. I have a update query like below Update A Set A.Col10 = E.Col10, A.Col11 = E.Col11 FROM TableA A INNER JOIN TableB B on A.Col1 = B.Col1 ...
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1answer
82 views

Should a table be split if only a particular column gets updates?

I have a table in my MySQL 5.7 database, which has 9 columns. One column is an AUTO INCREMENT PRIMARY KEY, where as the other 6 contain some data, which isn't going to be updated in a year. Now, the ...
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votes
2answers
296 views

8k row overflow error when updating row of size 5k

I'm trying to update a target table which has one row of size 5k to a row of size 5k also. Since it's one row it's easy to know the row actual size: select * from ...
7
votes
5answers
865 views

How to update 10 million+ rows in MySQL single table as Fast as possible?

Using MySQL 5.6 with InnoDB storage engine for most of the tables. InnoDB buffer pool size is 15 GB and Innodb DB + indexes are around 10 GB. Server has 32GB RAM and is running Cent OS 7 x64. I have ...
5
votes
3answers
7k views

Update statement is giving an invalid column name error, even though the column exists

I have a temporary table created at the beginning of this stored procedure. It is created successfully and can be selected from and inserted to. Here is the create statement CREATE TABLE ...
2
votes
1answer
241 views

How to merge 2 tables in Oracle

I have 1 big table with 25 milions of rows and i have to merge data of another table with 500,000 rows into the big table. the rows of both tables have the same columns and i have to check if the key ...
3
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1answer
62 views

UPDATE on column referenced in sub-query

We have a query that updates a column for all rows matching a condition which involves a subselect on said column, like the following: update CE_WORKSET_READ_ENTRY workset set workSet.MARK = 0, ...
3
votes
3answers
171 views

How can I optimise an Update on a large table?

I am using Oracle 11g, I have to update 7 fields on a table with 14 millions of rows, the updated columns get the new value from functions, the update looks like: update hslak set HSLAKSTS = ...
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2answers
155 views

UPDATE only if COUNT from another table is not zero

I update a table by counting the FK from another table as UPDATE table1 SET number = number + ( SELECT COUNT(*) FROM table2 WHERE table1.id=table2.id ) table1 is a big table, and I want to make ...
0
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1answer
40 views

Update row contents on some condition

For example, let's say I'm building a database for an auction system, in which various users can partake in both selling and bidding on different items, I'd want for an "Auction" instance to also ...
0
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1answer
83 views

Update if not exists statement

If I have a simple table with 2 columns and a composite primary key consisting of both columns, how do I rename one of the columns but only if it doesn't cause a primary conflict? Here's a simplified ...
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5answers
679 views

Why does this UPDATE fail with a unique key constraint violation?

I'm an "accidental" DBA, relatively inexperienced and baffled by this problem. Running MS SQL Server 2012. The problem is with this UPDATE statement: UPDATE dbo.tAccts SET Ticket ...
12
votes
5answers
114k views

How to update one table based on another table's values on the fly?

I have a table in the name of ips as below: CREATE TABLE `ips` ( `id` int(10) unsigned NOT NULL DEFAULT '0', `begin_ip_num` int(11) unsigned DEFAULT NULL, `end_ip_num` int(11) unsigned DEFAULT ...
6
votes
1answer
2k views

Optimizing concurrent updates in Postgres

I'm running concurrent Postgres queries like this: UPDATE foo SET bar = bar + 1 WHERE baz = 1234 Each query affects the fixed K number of rows, and I can't find a way to enforce the order in which ...
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1answer
41 views

Update by iterating table in batches faster than whole table in PostgreSQL

I have a table with approximately one million rows. It is being used in production and I ran an UPDATE which covers ~95% of those rows. After five hours I cancelled the request because it was taking ...
2
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3answers
141 views

UPDATE query periodically is slower by factor of 5000x

I run a site (Magento) which have a problem with a specific UPDATE query. Under heavy load, this query runs ~200 times/minute, and takes in average 1 ms (stdev 0.2 ms). However, at intervals of 1-2 ...
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1answer
73 views

Updating multiple mysql rows where column has specific value

I have 1 CSV file with 50,000 rows of data and 2 columns. The columns are user ID's and twitter profile photos. 24525,https://pbs.twimg.com/profile_images/666407537084796928/YBGgi9BO.png ...
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0answers
71 views

Why MySQL is still “using temporary” when update by primary key?

I have a partitioned mysql table, table size is about 100M rows: CREATE TABLE `nearby` ( `id` int(10) unsigned NOT NULL, `nearby_1` varchar(750) NOT NULL DEFAULT '', `nearby_2` varchar(750) NOT NULL ...
0
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1answer
125 views

Update all rows from a table with random foreign key from another table

I have four tables: (show on image below) Topic whit columns: ID primary key int CategoryID references to table Category int UserID references to table User nvarchar(128) User with ...