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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Multiple update of records in the same table

I have an update query. E.g. UPDATE table SET name = ? WHERE id = ? Now I have all the relevant ids collected. What I am doing is looping over the ids and execute the update query for each one. E.g ...
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2answers
1k 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 ...
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1answer
367 views

Mysql update table using ubuntu terminal

I have a CSV file that has 2 columns Name Email I have a table in my database that has the same columns + some extra columns. Now I would like to update my db table using that csv file. I mean ...
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1answer
74 views

Issues with 'plus symbol' output in PSQL on update query

Simple but frustrating issue... I'm trying to do an update command to correct a misspelling with this field: grouper=> select * from master_list WHERE group ~ 'JustAdopted'; group | ...
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0answers
15 views

How to categorize pairs of tags?

I have a table containing pairs of tags (say html tags) such as id tag tag_match 1 <div class="first"> 1 2 <div class="second"> 2 3 </div> ...
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3answers
99 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 ...
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1answer
106 views

How to UPDATE MAX and MIN of a GROUP BY?

I have a SELECT query of a table with GROUP BY id col1 category 1 some 1 2 x 1 3 another 1 4 x 2 // should be removed 5 some 2 6 x ...
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1answer
72 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 ...
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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) ...
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1answer
179 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 ...
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1answer
84 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 ...
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4answers
413 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 ...
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1answer
711 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 = ...
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0answers
58 views

How to retrieve pkey value in mysql/python on duplicate key update

I'm currently using _mysql library in python. it uses pkey(int, auto increment) value that's created when inserting data using function conn.insert_id() This is how the query is made. INSERT INTO ...
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0answers
438 views

SQLite UPDATE two tables from VIEW or TEMPORARY TABLE

Here is the query that doesn't compile just to show how it should look like. But since I can't do Multiple table UPDATE's. This fake query should be able to run the inner UPDATE's for both tables if ...
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1answer
86 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 ...
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1answer
135 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. ...
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0answers
55 views

Inserting and updating on same table

I am currently working on a database that aims to provide information regarding the amount of time people stay in a company's car-park premises. This is done using a table called "tbl_stay" which has ...
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1answer
524 views

INSERT / UPDATE to merge data, when empty data is an empty string

Consider a table of some family members: mysql> SELECT * FROM some_table; +--------+--------+--------+ | f_name | l_name | work | +--------+--------+--------+ | Meirav | Cohen | school | | ...
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1answer
76 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, ...
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1answer
86 views

Update , Select and Join using 3 tables

There are 3 tables: Label (Label_ID,Label_Name), Label_ID is Primary Key. Tracks (Prefix, Label_ID), Prefix is Primary Key,Label_ID is empty column Top100 (Prefix,Label) No keys in this table. My ...
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1answer
193 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`) ) ...
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154 views

Alternatives for UPDATE statement Oracle 11g

I'm currently using Oracle 11g and let's say I have a table with the following columns (more or less) Table1 ID varchar(64) Status int(1) Transaction_date date tons of other columns And this ...
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0answers
129 views

SQL queries are very slow

I have noticed that my queries are getting slower. Some update queries take about 48-50 seconds. Here's how it looks: [root@db-1 ~]# tail /var/lib/mysql/mysql-slow.log # Time: 131113 17:09:48 # ...
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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.
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2answers
127 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 ...
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1answer
392 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 ...
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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 ...
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1answer
110 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 ...
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1answer
136 views

Updating a local table with a per-row count(*) which is an aggregate of inner joins on remote server

I have a table of around 350m rows on a linked server in which I added an additional INT column to serve as a count(external_identification) of records as the result of a join on PACKAGE and DOC2. ...
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1answer
296 views

How to update a table by count from another table?

I have two tables as CREATE TABLE country_statistics ( id int(11) NOT NULL AUTO_INCREMENT us int(11), uk int(11), ca int(11), PRIMARY KEY(id) ) ENGINE=InnoDB DEFAULT CREATE TABLE entries ( id ...
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42 views

Is it better performance wise to check if a field needs update if you know the record does

In the queries we use all the records in one table that has data which needs to be placed in a another system had a Insert, Update and Delete flags (i, u, d being 1 in the record), this way we can ...
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2answers
155 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 ...
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2answers
1k 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 ...
3
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1answer
787 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 ...
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2answers
2k 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 ...
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1answer
156 views

UPDATE statment with and without SELECT keyword

I have been doing some testing on removing the SELECT keyword from this update: Update #tmpDriverTime Set WorkDay2 = (Select IsNull(Sum(PyblHrs),0) From spr_DriverTimeEntry Where ...
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1answer
116 views

MySQL Replace function throwing error

I am trying to update ^G (Ctrl G) in a table, below is scenario- CREATE TABLET TEST(COLA INT,DESCRIPTION VARCHAR(20)); I have crtl G in my data for description field, so to replace it with a \,I am ...
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3answers
850 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 ...
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1answer
54 views

What could I possibly be doing wrong with this update statement

UPDATE pcdbak SET pcdbak.Title = pcd.Title FROM pcd, pcdbak WHERE pcdbak.eCommNum = pcd.eCommNum This was the error message: [Err] 1064 - You have an error in your ...
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1answer
775 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 ...
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2answers
4k views

Optimizing bulk update performance in Postgresql

Using PG 9.1 on Ubuntu 12.04. It currently takes up to 24h for us to run a large set of UPDATE statements on a database, which are of the form: UPDATE table SET field1 = constant1, field2 = ...
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2answers
941 views

How to do something like UPDATE DELAYED in MySQL

I have an averages table that should keep track of an average value over time. I don't want to have a row for each value, just a single row that continuously updates the average. What I've come up ...
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votes
6answers
704 views

Backup very large table

I have to update certain values of a large table (for the sake of a presumed example, it is called 'Resource' and it is over 5M rows) and thus I have to make a backup before performing the changes. We ...
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1answer
136 views

String replace using concatenated strings from various columns

I'd like to remove a substring in a column via update statement. The substring to replace consists of multiple strings from other different columns but in strict order. The specification says: ...
3
votes
1answer
318 views

Oracle UPDATE followed by SELECT in LinqPad

I'm trying to UPDATE values in an Oracle database table (of salary information) that has no row IDs or a primary key. I'm writing these statements in LinqPad. This syntax should work just fine in ...
5
votes
1answer
5k views

What's the most efficient way to batch UPDATE queries in MySQL?

I'm writing an application that needs to flush out a large number of updates to the database for an extended period of time, and I've gotten stuck at how to optimize the query. Currently I'm using ...
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1answer
125 views

Update date Column values? any please help? [closed]

I Want to copy and data in same Table and Update date Column values? any please help?
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1answer
490 views

Is it there anyway to restore updated records in Microsoft SQL Server 2008 R2?

We have an test database configured with our web application. Due to internal web application error the entries were get updated in the database. Is it there any way to recover the updated records? ...
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1answer
2k views

How to check which tables in DB (MYSQL) updated in last 1 hour / last 1 minute?

I have to create a xls datafeed for a website and I would like to know which tables are getting affected when I do a manual entry from CMS. If i have installed fresh database and I'm doing first ...