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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4
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1answer
2k views

Update one table from another table while sorting that table based on one column

This is the problem I'm trying to figure out in MySQL. We have an old table contains some forms submitted by our users. Somehow, the previous decision was each time a user comes to this survey, a new ...
4
votes
1answer
1k 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 ...
3
votes
2answers
33k 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 ...
3
votes
4answers
918 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 ...
3
votes
3answers
6k 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 ...
3
votes
3answers
14k 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 bought_in_control_panel(ID,PARENT_ID,...
3
votes
2answers
9k 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
1answer
823 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 [...
3
votes
2answers
5k views

INSERT… ON DUPLICATE KEY UPDATE not working as I expect

I have a table called "Example" CREATE TABLE IF NOT EXISTS `example` ( `id` int(11) NOT NULL AUTO_INCREMENT, `a` int(11) NOT NULL, `b` int(11) NOT NULL, `c` int(11) NOT NULL, PRIMARY KEY (`...
3
votes
4answers
5k views

Update column with the sum of column in previous rows in MySQL

We have a table, essentially: id, amount, end balance, account_id I now want to re-calculate the end balance values (because of possible corruption) End balance is basically "end balance of ...
3
votes
2answers
61 views

Multiple Update with Multiple Conditions

We are told to watch out for things being set to null (we dont want) by using the IN clause in the following: UPDATE Tests SET TestScore = CASE WHEN TestId = 10 ...
3
votes
3answers
1k views

INNER JOIN Giving time out on large database

Getting time out on this script UPDATE uk_data AS ud INNER JOIN uk_pc AS up ON ud.cat10 = up.WardCode SET ud.cat8 = up.Latitude, ud.cat9 = up.Longitude; uk_pc Table ...
3
votes
2answers
50 views

Alter the letters after “ACCOUNTS\” to lower case?

I have a database table, users, with different username cases (see the example). How can I update the letters after ACCOUNTS\ to lower case? ACCOUNTS\James.McAvoy ACCOUNTS\michael.fassbender ACCOUNTS\...
3
votes
3answers
889 views

Problems updating with inner join with multiple on statements

I have an orders table on a database that contains geographical information about the city and state that the order is from. This includes latitude and longitude for doing haversine calculations. I ...
3
votes
3answers
418 views

INSERT/UPDATE in same query from previous SELECT with some singularities

I'm trying to perform a INSERT|UPDATE by selecting data from another DB and this is what I have so far: INSERT INTO pdone.reps (veeva_rep_id,display_name,username,`first`,`last`,email) SELECT ...
3
votes
2answers
1k views

How to update ID=null values in table to incremental counter values?

On SQL Server 2012, i've got an intermediate/staging table for merging existing with new data, where I want to insert numeric IDs for newly created rows: ID NaturalID Comment 1 ...
3
votes
2answers
152 views

“Upsert” trigger writing mass duplicates from SSIS

I have a problem with an "upsert" trigger, being triggered by a SSIS package with fastload. (FIRE_TRIGGERS is enabled) CREATE TRIGGER [dbo].[MP_VOL_UPSERT] ON [dbo].[vwMP_VOL] INSTEAD OF ...
3
votes
2answers
48k 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 ...
3
votes
2answers
1k 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 ...
3
votes
1answer
52 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 ...
3
votes
1answer
356 views

How to insert/update millions of rows inside a sql server table(s) in an effective way?

Often in my job I have to create a procedure inside SQL Server that will process millions of data rows, save them into a temp table (staging table) and finally save them into a table (s) in a database(...
3
votes
1answer
242 views

Update columns values using select from external database and table in MariaDB trigger

I have two databases pdone and veevan. pdone is a kind of master and veevan keep on continue sync against an external sources. I need to perform a internal sync between veevan and pdone so I am using ...
3
votes
1answer
639 views

How to reuse an update trigger for multiple tables in postgresql?

In the database for a new project, I've started the convention of having each table have a last modified timestamp column. To implement this, I wrote a trigger for each table: CREATE TRIGGER ...
3
votes
1answer
1k 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
1answer
22 views

UPDATE a column in one table according to a column in another

In Postgres, I have two tables that have become de-normalized. We're in the process of migrating to a normalized form, but in the meantime the tables have become out of sync. I'd like to copy the ...
3
votes
2answers
51 views

MySql - Ranking so it only needs to be done once

By reading around, this seems to be a reasonable way of ranking people. The table: UserId (int primary key) Name (varchar(100)) Score1 (int highest scores rank 1) Score2 (int, if Score1s are equal, ...
3
votes
1answer
87 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 ...
3
votes
1answer
169 views

How do I make this Postgres view that performs a join updatable?

I've got two tables, products and subscriptions: CREATE TABLE products ( id bigint NOT NULL, title character varying(75), description text, manufacturer_id bigint, created_at ...
3
votes
1answer
44 views

Why does the behavior of array syntax differ from '(?,?)' syntax when updating a point field and that field is NULL?

I'm using PostgreSQL 9.3.5. Suppose I have the following table: CREATE TEMPORARY TABLE point_test ("name" varchar(255), "pt" point); I then insert a row, leaving pt NULL: INSERT INTO point_test (...
3
votes
2answers
11k 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 ...
3
votes
2answers
2k 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 ...
3
votes
1answer
5k 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); ...
3
votes
3answers
211 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 = ...
3
votes
1answer
116 views

MySQL not updating a row (zero row(s) affected) [closed]

I cannot figure out why MySQL 5.6.25 will not update an existing row: SELECT lcl_booking.file_number_id, lcl_booking.entered_datetime, lcl_booking.modified_datetime FROM lcl_booking WHERE ...
3
votes
1answer
4k 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 ) = ( ...
3
votes
1answer
5k views

update statement with self join

I needed to copy information from one row of a table to another. I noticed I could do the following: update address set col1 = a2.col1, col2 = a2.col2, .....etc from address a1, address a2 where a1....
3
votes
2answers
690 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 ...
3
votes
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
1answer
112 views

SQL Server: UPDATE permission for table variable

SQL Server 2012 I have a maintenance script that I wrote for some of my operators. They are members of the fixed db_datareader and db_datawriter roles. Part of the script creates a table variable, ...
3
votes
2answers
207 views

Updating large table worked before, now taking hours

BACKGROUND: I am using a non-production SQL Server to manipulate a large data set and run a few basic calculations. The original data file I have, which is about 30M rows, is missing records (not NULL;...
3
votes
0answers
197 views

Unable to Update on SQL Server 2008 R2

This is a bit strange so bear with me please. After installing a new SQL Server 2008 R2 on a new server (Windows 2012 Standard) just like the production one, I tried to connect my web aplication (...
2
votes
2answers
10k views

After update triggers that deal with multi-row updates

Currently working on an database Audit project based on triggers that are fired on update on specific tables. The triggers write the changes into a table; information written are: table name, updated ...
2
votes
2answers
604 views

Update column with value of another column or another column

With PostgreSQL (I'm using the version 9.1) is it possible to do mass update with a single query a column value with the value of another column, but if the other column value is null, to use the ...
2
votes
3answers
2k 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. ...
2
votes
2answers
329 views

MERGE command in SQL Server 2005

I have been trying to develop a MERGE in SQL Server 2005. It does not have all features yet, because I have been struggling in "how to put the merge logic WORKING AS A SET, rather than rows". ...
2
votes
3answers
3k views

How to handle big data update based on excel spreadsheet

Scenario Select-based data is exported from DB to Excel spreadsheets. Some manual work is done on the excel files (filling missing data). Changed data from excel files is updated back to DB. ...
2
votes
1answer
3k 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 -- =======================================...
2
votes
2answers
73 views

Very tricky: Can't update a sequential list SQL-92 ( Filemaker)

I have a quite simple problem, but the solution is very tricky. I'm trying to solve this for months: There is a column "SortID" that needs to get updated with sequential integers, starting from 1. ...
2
votes
2answers
93 views

Percona 5.7 tokudb poor query performance - wrong (non-clustered) index chosen

I have a table with about 8.5m rows in it. The table is tokudb and it has the indexes described below. I'm experiencing dismal performance when trying to run update statements like the following: ...
2
votes
2answers
458 views

UPDATE table with another table data

I want to update the table car_check field fencing.(total 40 rows).I also use postgis function. I think it's a little difficult.Any suggestions? The code is the first carid example. UPDATE car_check ...