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 find all schemas where a table has records?

In my Oracle database, I have a number of schemas (users/owners) with similar table structures (about 100 in total). However, some tables are empty in a lot of schemas. Is there a way to find out for ...
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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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34 views

Get all the users that are managed by a targeted manager

I have the following model: Table user: (id, name, direct_manager_id) Table customer: (id, name, managed_by_id) i.e. users can have another user as their direct manager, Customers can be managed ...
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1answer
47 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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1answer
157 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
82 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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1answer
45 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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34 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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1answer
147 views

Copy Data To Different Server using SELECT * INTO?

I'm not a DBA by any means. I'm just knowledgeable enough with the MySQL command line to be capable half the time and dangerous the rest. Today I was working on exporting data from a one DB into ...
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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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1answer
94 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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1answer
60 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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1answer
151 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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1answer
53 views

Query to select distinct name based on several factors

I have a table with the following data (simplified here): ID | PolicyName | Setting | State | Value 1 Default DiskUsage Enabled 1 2 Default Memory Enabled 1 3 Default CPU Enabled 0 4 Personal ...
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0answers
39 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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1answer
110 views

SQL Server sometimes uses a lot more cpu for query

I have a stored procedure with a quite heavy SELECT statement that includes five joins and uses FieldName LIKE '%searchterm%' on multiple columns. This query usually finishes in about 2-5 seconds. But ...
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1answer
119 views

How to union tables into a new table in mysql? [closed]

I have a table as following: id col1 col2 col3 type 1 12 12 23 1 2 23 33 1 0 3 333 2 21 1 ..... I try to select 1% sample of where type=1 and all the data where type=0, I ...
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1answer
168 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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1answer
36 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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60 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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1answer
188 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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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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21 views

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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30 views

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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9 views

Improving the performance of this select query [duplicate]

i have two tables TABLE 1 and TABLE 2 And i am running this select query to fetch the data , it takes long time to run SELECT TABLE1.* , TABLE2.COL1 , TABLE2.COL4 FROM TABLE1, TABLE2 WHERE ...
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1answer
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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89 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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1answer
238 views

How to remove duplicates in col1 and get group MAX in col2? / mysql

Given the following table: col1 Col2 A 1 B 1 C 1 B 2 B 3 A 0 C 5 how do I write a SELECT query (I just assumed has to be SELECT) that returns the unique items of col1 and the ...
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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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105 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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1answer
730 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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340 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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47 views

mysql select query optimization [duplicate]

Possible Duplicate: mysql select query optimization I have two tables, testa and testb. CREATE TABLE `testa` ( `id` INT(10) NOT NULL AUTO_INCREMENT, `name` VARCHAR(50) DEFAULT NULL, ...
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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 ...
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2answers
56 views

How to split a row in a result into mutliple rows

I have the following query: SELECT vs.MonthName AS Month, vs.Region, vs.Category, CAST (MIN (a.TotalAmount) AS money) AS ActualAmount, MIN (a.TotalCases) AS ...
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2answers
69 views

Selecting rows with condition on two columns together

i have table with columns Number and VAT How can i select all rows without row which is Number=123 and VAT=15 ? I tried something like this SELECT * FROM tablex WHERE <.. zilions of ...
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1answer
114 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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3answers
115 views

Add Contents in a Column and make them 0 [closed]

http://sqlfiddle.com/#!3/96f11/3 In the above fiddle, I need the required output in the Fiddle. ie., The UserID column in Filtered Table and Main table are equal. I need to get the Amt column data ...
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2answers
3k views

How to get missing values in row order?

In a table, many rows have been deleted, how to get the id of missing rows for next INSERT? For example id col1 1 1 3 3 4 4 5 5 8 8 9 9 how can I get the ...
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1answer
2k views

'ambiguous column name' error refers to database, table, and column [closed]

sqlite3 gives an 'ambiguous column name' error with the query below. The error itself references what seems to be about as an unambiguous column name as one can imagine, identifying the database as ...
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2answers
4k views

How to do division from select statements in sql server?

I am trying to create a select statement that can return a table of 1 column. Basically, I am looping through all the records of NewHire, and then using its id, to select stuff from another table. I ...
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2answers
2k views

Select query having count and variable

I have a table like the one below. I need to form a select query. I'm going to pass a RefID like SELECT SNo FROM Register WHERE RefID = 1 And beside the SNo in the Statement, I need to have ...
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1answer
49 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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2answers
146 views

Fetching Recently added rows from table [closed]

I have the following table structure , name || description || timestamp varchar varchar date time stamp column consists of time the row is added Now i need to fetch the ...
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1answer
30 views

SELECT rows with duplicate values

I have a table of names in mysql InnoDB as Firstname Lastname Steve Ross John Doe J. Doe Mike Ross Michael Ross Roger ...
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1answer
108 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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1answer
267 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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1answer
92 views

Optimization of a select statement

I'm using MySQL and have a table user_data like this: user_id int(10) unsigned reg_date int(10) unsigned carrier char(1) The reg_data is the unix timestamp of the ...
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2answers
1k views

SELECT only values THAT are different

I have two instances user1 and user2. They have colors u_id | color<br> 1 | red<br> 1 | green<br> 2 | red<br> 2 | blue<br> I need a mysql request, that ...
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1answer
14k views

How to get MAX and MIN in GROUP BY query?

In a simple query SELECT col1, col2, col3 FROM table1 GROUP BY col1 each row includes the first value of col2 and col3 for each unique value of col. How to select MAX and MIN for each value of ...