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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how to cache a subset for cascading select queries in mysql

Here is another database problem I stumbled upon. I have a date-range partitioned MyIsam look-up table with 200M records and ~150 columns. On this Table I need to perform cascading SELECT-Statements ...
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164 views

MAX (id) function with MySQli

How can I use the following statement to return only the record with the maximum PersonID from the table? /* Create the prepared statement */ if ($stmt = $mysqli->prepare("SELECT Max(PersonID) AS ...
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57 views

Slow Query with LIMIT

We have this query: SELECT "messages".* FROM "messages" WHERE "messages"."account_id" = 1 AND "messages"."status" = 'unread' AND (created_at >= '2014-04-24 01:00:00.000000') ORDER BY id DESC It ...
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64 views

Selecting most recent date when dates are stored in another table

Working in a MySQL database, I have tables set up like this: Table song_instances has song_id (int), meeting_instance_id (int) The meeting_instances table has columns meeting_instance_id (int), ...
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Mysql: Problem using GREATEST with IFNULL and join

I have a query selecting the greatest value of 2 timestamp. To Achieve it I'm calling: SELECT GREATEST( IFNULL( tableb.create_time, 0 ) , IFNULL( tablea.create_time, 0 ) ) I'm using IFNULL because ...
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42 views

on every row on SELECT Query must lookup to other table

I'm working on Login/Logout System and I'm facing this problem regarding on SELECT Query. I have 2 tables namely dtr_tbl and shift_tbl. In dtr_tbl are the logs of the user(login/logout time details) ...
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46 views

CONCURRENT SELECT's SLOW … LOCK IN SHARE MODE

My Table has 25 Million rows total and 6 million rows satisfying below where clause. Select 1: select max(stamp) from Table where type = "string" LOCK IN SHARE MODE ; 6000+ seconds Select 2: ...
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24 views

Padding MySQL queries

I'm trying to retrieve logs of our plant where a certain event has occurred. At the moment, I can query the actual event by using an alarm_code field. However, I'd also like to include about an ...
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31 views

Slow query while selecting a higher offset from millions of rows

I have sort of security log files containing millions of rows. On my current testing I imported the data for one month which is the sum of ~14,000,000 records. The table contains several set of fields ...
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22 views

How to modify the below script to take tables and its sizes for a particular databse to send via mail to a recipient?

SELECT top 10 t.NAME AS TableName, (SUM(a.total_pages) * 8)/1024.0/1024.0 AS TotalSpaceGB FROM sys.tables t INNER JOIN sys.indexes i ON t.OBJECT_ID = i.object_id INNER JOIN ...
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39 views

select statement for subtype

Okay, so all I'm trying to do here is list the managers who supervised the employee that charged a customer $100 for a rental on November 1st, 1998. My issue is that I don't know how to select the ...
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42 views

Need help in incrementing the date in oracle

Error thrown as "Invalid number" while trying to increment the date. Given below is the query executed through sqlplus. Please help me on this. select ''''||to_date(:To_date, 'dd-mon-yyyy')+1||'''' ...
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107 views

Processlist show most of the queries are sending data for select query

I have faced some problem like sending data state in processlist. In my application I used parallel processing which send 50 count at a time, and that will do some MySQL database operation (select and ...
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1answer
80 views

using update query with subquery in Oracle sql

I have an update query where I am trying to update a field but for more than one record, I am trying a join but it doesn't work. Below I get multiple values that come back from the select statement ...
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44 views

How not to display column name during select query

I have a sql file which prints the count(*) of some tables and result of it is something like this. COUNT(*) ---------- 10443 COUNT(*) ---------- 497 COUNT(*) ---------- ...
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88 views

What is wrong with this SELECT query? No errors, no results

Haunted by this MySQL query that refuses to return results: select entity_id from customer_entity where entity_id NOT IN (SELECT sfo.customer_id FROM sales_flat_order sfo); If you divide the two ...
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53 views

Query execution involving two servers in SQL server , is really slow

I am running the following query , and it takes over 1 hour to finish execution. As there are so many joins and then one union is involved, is it normal for this query to be executed in 1 hour, or is ...
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133 views

Speeding up a simple select query on Mariadb

I have a 100k rows table with the following structure: +----------+------------------+------+-----+---------+----------------+ | Field | Type | Null | Key | Default | Extra | ...
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161 views

How can I optimize this Cross Table COUNT() mysql query?

I am trying to cut down the retrieval speed of this MySQL query. All instances of COUNT() point to the PRIMARY key of each field. Currently this query makes my MySQL hang. It seems ridiculous as I'm ...
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34 views

how to optimize grouped select from an already grouped select query

I already had a specific query to get a number of shops, but I couldn't sum the cost field, I kept on getting an error on the sum function, but it worked when I did this; select tab.shop_id, ...
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170 views

SQL SELECT - adding field to SELECT with JOIN is changing the results

I have a SQL sentence with JOIN, running on mysql 5.5.16: SELECT DISTINCT (ot.orders_id), ot.value FROM orders_status_history osh INNER JOIN orders_total ot ON ( osh.orders_id = ot.orders_id ) WHERE ...
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41 views

How to get desired type of records for desired number of times in oracle

I want to get get 6 "double_scoring" records and 4 "singe_scoring" records from my Profiles table based on SCORING_RULE column values. Can you please let me know how can I do this with SELECT query ...
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112 views

Select historical prices for an exact datetime - MySQL

I have a price_list table where I store historical prices for each item. columns are - id, name, price, start_date, item_id When a price is changed, a one new row is inserted with a current ...
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686 views

Getting the top count of records from a table for each month and user

I have a table where translations are stored along with the user_id and when the translation was added. I want to create a query that shows the 'Translator of the month' (the person who did the most ...
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100 views

Select latest record for each ID

I have three tables that contains data as below: Users Id Name Other_Columns --------------------------- 1 John Blah 2 Ricky Blah 3 Stella Blah 4 Bob Blah Saldo Id ...
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239 views

Restrict access to rows by usename

In my database i store data of different users (e.g. addresses or invoices) in the corresponding tables. I want to make sure that a logged in user only has access to it's own data in the tables (so ...
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349 views

mariadb out of memory crash

I have recently migrated from mysql (5.5.36 MySQL Community Server (GPL)) to MariaDB (10.0.10-MariaDB-1~wheezy), along with switching my cloud hosting provider. Both machines have 2GB RAM and 1GB ...
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40 views

How to use the value from record like as varchar?

I'm trying update a old table with result of selec for another tables but get a error using this sintaxe (e.g.): DO $$ DECLARE _roles refcursor; _onerole varchar; _record RECORD; ...
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115 views

two column compare ,get count(*) of two column A value same cloumn B value

I have a Mysql table as --------------------- -- page - user -- --------------------- -- page a - user 1 -- -- page a - user 2 -- -- page a - user 3 -- -- page b - user 1 -- -- page b - user 3 -- ...
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65 views

Select all foreign key relationship chains from any set of potentially gapped table names

I am using this query to find all foreign key relationships: SELECT con.relname AS child_table, att2.attname AS child_column, cl.relname AS parent_table, att.attname AS parent_column ...
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40 views

Multiple selects ordering desc from single table

I'm trying to do multiple selects to give multiple ordered columns. I'm struggling to get the below mysql query to achieve the output I want. SQLfiddle: http://www.sqlfiddle.com/#!2/a1002/3 ...
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SELECT, PROJECT, CARTESIAN PRODUCT and JOIN

I have the following tables; DOG +----------------------------------------------+ | Name Type Age Kennel_name Owner_name | +----------------------------------------------+ ...
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139 views

How to join the tables in mysql to get wall messages and comments with name of person ? Only user and his friends messages

I have four tables in my mysql database as shown in the image url provided. I want to select data from the tables without duplication. I want to show messages and comments on wall according to the ...
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182 views

Get all comment.message, status.message, users.* and profiles.* where users.user_id exists in friend.friend_id or friend.user_id

I need some help building this query because it's a bit complicated at least for me. I need to get all comment.message, status.message, users.* and profiles.* where users.user_id exists in ...
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40 views

I want to rewrite my MySQL query so that FIND_IN_SET doesn't do a full table scan unless necessary

I want to rewrite my MySQL query so that the last table join doesn't do a full table scan unless necessary. Here's what I mean. Under certain conditions I don't need to select any rows in that join ...
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49 views

SELECT from Function that return CURSOR

I would like to select from a function that return a SYS_REFCURSOR Type value. for example : CREATE OR REPLACE FUNCTION my_funtion ( my_param IN VARCHAR2) RETURN SYS_REFCURSOR IS ...
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26 views

Use join to aggregate data from various normalized tables

I have a database as follows: tbl_clients (Primary Key: client_id, Foreign Keys:place_id,district_id,zone_id,country_id) tbl_places (Primary Key: place_id) tbl_districts (Primary key: district_id) ...
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Need help on transferring data from a PostgreSQL database to a future (to be decided) database!

(English isn't my native language) I'm doing an internship for school and my task is to theoretically describe the best way to transfer the data from their current database (PostgreSQL) that they have ...
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32 views

SSRS using select from (Select)

I want to report a script which contains a Select from (Select), when I just run the second select I have no problem but when I put the whole script it loads and nothing happens. Here's my code : ...
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37 views

mysql:Multi tables SELECT Query

I have 2 tables in my database table_names, with the fields: id, name, join_date, country table_sigs, with the fields: id, pet_title, act_date, member_id I would like to know how many members ...
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36 views

SQL JOIN excluding duplicate

I'm using PostgreSQL under ubuntu 14.04. I have two tables as below: create table material_base_name ( id bigserial, base_name varchar(50), constraint pk_materials_base_name primary key (id) ); ...
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54 views

Text comparison select query needed that finds most whole word matches within larger string

I have a database of products, many with similar names. For example... iPhone 5s (GSM model) A1533 iPhone 5s (GSM model China) A1518 iPhone 5s (GSM model China) A1530 iPhone 5c (GSM model) ...
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60 views

Select and sum from related columns

I have table with the following columns: date (month), hours/days (31) and daily tasks (31) Columns: date day1 day2 day3....task1 task2 task3.... Records: june 4 6 2 .... run walk ...
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How can I check the size of my SELECT query? PostgreSQL

I know how can I check the size of my database, called test: SELECT pg_database.datname,pg_size_pretty(pg_database_size(pg_database.datname)) AS size FROM pg_database where datname='test'; Now, I ...
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SQL Get result as a column

Is it possible to get a result as a column? The SELECT query will only need to return one record, however, at the time of querying the database it will not know what attributes are in the table, and ...
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88 views

Name for SELECT equivalent of UPSERT

UPSERT means INSERT and\or UPDATE, is there a standard name for a sproc that will INSERT if necessary and then SELECT? e.g. I want to get the IS of a row that matches fields and give me the ID, if ...
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1k 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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100 views

How to grant privileges for a user to create views on specific tables on Oracle SQL?

I just added: GRANT CREATE VIEW TO user1; But it gives user1 access to ALL the tables, I would like them to only have access to the tables where the field X is user1
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329 views

How to increase MySQL performance with joins

I have a MySQL database with InnoDB engine. Particularly one of my queries became very slow. The query is shown below: SELECT t1.`ARTREF1` FROM `lijnen` AS t3 INNER JOIN (`kortingen` AS t2, ...
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102 views

Being careful about additional records being added in a duplicate record merge?

We have a multi-user MS-Access 2003 database. Connecting to it using SQuirrel SQL, and the JDBC/ODBC bridge, I've managed to eek transactions of some sort out of JET by turning off autocommit. I've ...