A core SQL statement, SELECT retrieves data from one or more tables or other sources of row set data such as views or table-valued functions.

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Lock mysql table to prevent select and insert at the same time

I know this question has been asked earlier and I have also read the documentation. But I guess I'm stupid not understand. I have a code that inserts a row and the row should be unique in several ...
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MySQL - SELECT Columns from results of another Query [duplicate]

I'm trying to use a dynamic range of columns fetched from another query, specifically I want the results of this query: SELECT COLUMN_NAME as DYNAMIC_COLUMN FROM information_schema.columns WHERE ...
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103 views

Select not repeated results from same tables in different databases

I have 3 tables in 3 different databases which are exactly the same. I'm trying to sync from this 3 databases to a master database as shown in the picture below: Right now I am running the same ...
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1answer
214 views

Count distinct values of a column and insert them to another table

So, I have a database for logs and statistics. But, the amount of data sent is too high, so I was thinking of grouping the data into another table. So the structure of the original Database is: ID ...
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2answers
170 views

Error on simple Select statement: Subquery returned more than 1 value

When I query a table select * from tableName it returns error msg Msg 512, Level 16, State 1, Line 2 Subquery returned more than 1 value. This is not permitted when the subquery follows =, !...
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1answer
28 views

Selecting different variables depending on another variable [closed]

I must make a new table with filling up fields depending on a variable. If type = holder, then I should take the enterprise field, if type = requester, I should take the name. How do i write this in ...
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2answers
92 views

Query to know who paid more than 10k

I have a table with payment informations, like this: ID COSTUMER_ID DATEPAID AMOUNT 1 1 2012-01-01 50 2 1 2012-02-01 100 3 1 2012-03-01 70 4 2 ...
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2answers
60 views

select where column with a %

How can I select all records with a % in? I think this code doesn't work. SELECT column1, column2 FROM table WHERE column1 LIKE '%%%' first and last % for zero, one or more chars second % for the ...
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1answer
361 views

selecting same column twice for different value

I have a table like this; event_id pair versus score 1 1 11 100 1 1 12 0 ... 1 11 1 0 1 12 1 50 Now I want to ...
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1answer
215 views

Select last record from my table [closed]

I am new to SQL and PHP. I'm having a problem with selecting the last record from my table. I run the following query: SELECT * FROM 2521118 ORDER BY id DESC LIMIT 1 My table name is 2521118 and ...
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2answers
320 views

Remove duplicates from multiple joins

I'm using WordPress $wpdb->get_results for this query (it is simplified for question purposes): SELECT customer.id, customer.name, address.address appt.appointment_date, pay.date FROM customers ...
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2answers
578 views

MySQL: Show list of tables with paging in Terminal

I am using MySQL Ver 14.14 Distrib 5.5.44 for debian-linux-gnu. How can I show my tables page wise in a terminal?
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29 views

I want a select to give me id's that are not in a consecutively order

I have an Oracle db with a table like this: +----+-------+ | ID | INDEX | +----+-------+ | 1 | 0 | | 1 | 1 | | 2 | 4 | | 2 | 5 | | 2 | 6 | | 3 | 0 | | 3 | 1 | | 3 |...
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3answers
82 views

Generate a list from columns that do not contain a zero for each row

I have a table TAB1 in an Oracle database: +----+----+----+----+----+----+ | ID | C1 | C2 | C3 | C4 | C5 | +----+----+----+----+----+----+ | 1 | 1 | 0 | 3 | 0 | 5 | | 2 | 11 | 22 | 0 | 44 | ...
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1answer
337 views

Exactly what error is returned by PostgreSQL `FOR UPDATE NOWAIT` when a selected row cannot be locked immediately?

The PostgreSQL 9.4 documentation states that adding the NOWAIT option to a SELECT FOR UPDATE means an error is generated when a row cannot be locked: To prevent the operation from waiting for ...
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1answer
44 views

Extra “count” row with total of 0

Consider the following: db=> SELECT ga, count(ga) FROM gb GROUP BY ga ORDER BY ga ; which gives the following output: ga | count ---+------ ? | 200 A | 100 B | 50 | 0 (4 rows) ...
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4answers
417 views

WHERE NAME LIKE ( A SET OF NAMES )

I would like to drop all the jobs related to a set of specific databases. So I have added all the names into a table variable and I was trying to generate the scripts to drop the jobs. how can I ...
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2answers
361 views

Select Between Date Range Mysql

I want to select records between 2 dates: select * from orders where orders.created <= '2015-07-31'; select * from orders where orders.created >= '2015-07-01' and orders.created <= '2015-...
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1answer
59 views

Recommended Database(s) for Selecting Random Rows

I'm familiar with selecting random rows from a table in PostgreSQL. It's really slow. I've looked into some other databases and they all seem to be bad at it. Mostly because it's not a normal use case ...
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41 views

Row locks on selects

select t.*, row_number() over ( partition by t.Entity_Identifier order by t.Message_Sequence ) as seqnum from Process_Activity t (ROWLOCK) where t.Process_Id = Is it possible for ...
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1answer
170 views

Fast alternative for “NOT IN”

I have a table A that got a field called id that is the primary key of this table. I also have a table called B which also have a field called id as primary key. Now I want to get all rows from ...
4
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2answers
2k views

Select only those records that have different/multiple values for a particular column

Below is an example of my membership table. There some records having multiple values in the email field. I only want to select those records that have multiple email values: Member table ID ...
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2answers
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MYSQL Select, where rows exists

I have a Mysql Database and tables with the structure: Table 'photos' - ID, Name Table 'photos_tags' - Key, Photo_ID, Tag My goal is to select all photos, which has one tag (it's not a problem) ...
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3answers
187 views

If in mysql I have string `xxx yyy` - how can I SELECT this if user input `xxxyyy`?

My online-shop in PHP (OpenCart). On site we have product-search. For example product have name iSport 220, and if user search input string is iSport220 we must show this product. And vice versa. ...
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2answers
66 views

Cannot build correct SELECT in MySql

Please help me to create a correct MySql query, which I failed to do. I have 2 tables in our DB: CREATE TABLE IF NOT EXISTS `user_audit` ( `id` int(10) unsigned NOT NULL AUTO_INCREMENT, `user_id`...
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72 views

PostgreSQL, merge join results

I have 2 tables with common columns and would like to know if it's possible to request this 2 tables by merging the results. Table "job" : parent_id, target_id, start_date, end_date, jobposition_id ...
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1answer
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How to Choose Between VALUES and SELECT for INSERT?

This answer raised the question for me how to choose between VALUES and SELECT in such a function . Using PostgreSQL 9.4.3 on x86_64-unknown-linux-gnu, compiled by gcc (Debian 4.9.2-10) 4.9.2, 64-bit: ...
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2answers
878 views

Optimizing WHERE condition for TIMESTAMP field in MySQL SELECT statement

I am working on a schema for an analytics system which tracks usage times, and there is a need to see total usage time in a certain date range. To give a simple example, this type of query would be ...
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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 ...
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2answers
120 views

Select rows from T such that sum(T.quantity) is greater than an argument

TLDR: I need a way to limit my select such that only rows needed to fill my new order are returned. Hey, I'm looking for a better way to do a query on the simplified toy table below. Right now I do a ...
2
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1answer
42 views

I want to select all records for those persons who have one or more entries that equals zero dues

DUES_TABLE ID LNAME FNAME DUES DATE 3456 Smith Bob 12.50 2014-10-01 3456 Smith Bob 0.00 2014-11-01 3456 Smith Bob 12.50 2014-12-01 9450 Jones ...
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Select all from table using procedure oracle

I am trying to execute the select command in a procedure.Initially i retrived all of the columns of the table in the procedure using cursor. The real problem comes when I am trying to access the ...
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1answer
41 views

Unexpected SELECT permissions

My user WebApp seems to have SELECT permissions on every table in every schema and I can't figure out why. WebApp is only in the Public role. Public doesn't own any schema. Explicit permissions ...
4
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1answer
77 views

How to only update if nothing has changed? I need to validate several things before I insert

Say I have two tables: runners and waypoint_checkins. I want to add waypoint checkin entries but I can never add a waypoint if the runner has finished the race, (see below for schema). Finally. A ...
2
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0answers
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How to order by fields of joined table while selecting for update?

For selecting some rows of table Fwt_Chipkarte for update I use the following SQL statement (IBM DB2): SELECT o.Archiviert, o.Id, o.IdComm, o.Kartennummer, o.Konto, o.LetzteAenderung, o....
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Select data where column value exists in seperate rows for same reference id

This is on a MySQL database. Locations have services. What I want is to get all results where service_id is 2 AND 3, not OR so using IN is out I believe. Database ---------------------------- | ...
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1answer
49 views

Group-by in an Oracle database

on an Oracle database. If I make an: select id,id_operator,denumire,cod_fiscal,loc_den,str from rap where is_punct_lucru=1 and id_operator in ( select id_operator from rap where ...
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130 views

MYSQL Select Distinct with SUM

I am developing a Stocks management application, the Portfolio register table has 4 columns, other than date and registry_key, and it looks like this: ---------------------------------------- | ...
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1answer
55 views

Multiple left join where not in another table

I have the following tables (there is more detailed data in each one, I just put the minimum to create a sample): __________ _____________ _____________ _____________ | person | | provider | | ...
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129 views

Select sub columns from a view

I have a large view in Sql Server named ViewA which looks like Select ColumnA, ColumnB, ... ColumnZ FROM TableA Join TableB ON ... Join TableZ ON This view gives me exactly what I need in ...
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1answer
71 views

How to select users that doesn't in the role

I have 4 roles which are Admin, Procurement, Accounting, HR roles and 3 tables which are Users, Roles and Userroles. They user can have many roles as well as the roles can have many users. the problem ...
2
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1answer
126 views

Select last row for a certain group

I have two tables: Table users columns | type | notes --------|--------|------- id | bigint | PK ... | ... | ... Table events columns | type | notes -----------|---------|-----...
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1answer
212 views

SELECT w/ INNER JOIN Query on Optional Columns

I have five tables: File2, Branches_of_Study, Schools, Education_Establishments, and Certificates. File2 is the transaction table with all the other tables as reference tables. File2 is all about the ...
2
votes
1answer
74 views

Insert into a DB that was selected via other DB?

I have a table that stores what database should I use for a given device( specified by its IMEI), like this: imeiDB( IMEI VARCHAR(15), db VARCHAR(100)); Let's say I have the database device1(IMEI:...
0
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2answers
42 views

Which query performs better when searching a row where a column has maximum?

Consider a simple table for example purposes: person(name varchar, age int) I have a task to retrieve the oldest person. Which query is better in general for such problems? Query 1: criteria with ...
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4answers
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MSSQL Select all parent rows for which exists a combination of children rows with desired value

I would like to select all parent rows for which exists a combination of children rows with desired value. The easiest approach is to use multiple exists clauses, but this is not optimal - anyone ...
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1answer
141 views

Grouping based on the status, then count its product and the total based on its category ID

I have a table with product ID, category ID and status of the product. +---------+-------------+-------------+ | id | cat_id | status | +---------+-------------+-------------+ | 1 ...
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3answers
406 views

REPLACE INTO SELECT from table

Is there a way in DB2 to replace the entire table with just selected rows from the same table ? Something like REPLACE into tableName select * from tableName where col1='a'; (I can export the ...
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1answer
66 views

Postgres: Disable “similarity” column output on “SELECT SIMILARITY”?

I've tried disabling similarity column output on SELECT SIMILARITY but still cannot. Below query will generate a column similarity: SELECT SIMILARITY(title, 'Nation'), title FROM gallery WHERE title ...
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1answer
112 views

MySQL select with join table

I have 3 tables, one of them is join table: user table: CREATE TABLE `user` ( `id`, `name`) media table: CREATE TABLE `media` ( `id`, `value`, `type` enum('M', 'T')) user_media table: CREATE ...