Specifies the type of data being stored (string, date, numeric, etc).

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0
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0answers
388 views

varchar() vs TEXT with utf8 encoding character length limit

I'm building a huge dashboard for a big website. And I'm now in the phase of creating the database and it is very very big with a lot of relations. So I want to build something that doesn't consume ...
1
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2answers
311 views

MySQL database column to Store Phone numberss

What is the best approach to store Phone Numbers (Mobile Number and Office Number) in MySQL table? Users may have MobileNumber (CountryCode and MobileNumber) and Office Number (CountryCode, ...
1
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1answer
84 views

Low cardinality fields: integer or string

A Ticket has the statuses: new in_progress on_hold closed I could make ticket.status a string (on_hold) or an unique int(2). It is indexed. Int pros: smallest size in index Int con: low clarity ...
0
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1answer
184 views

Teradata sql syntax from date to quarter

Need a Teradata sql syntax to extract quarter from a date. Given below is the expected output Date: (YYYY-MM-DD) 2015-09-12 2015-05-22 2014-12-15 Output 3Q15 2Q15 4Q14 Query which I have ...
0
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1answer
33 views

Working with PostgreSQL information_schema and tables (with same names, in different schemas) whose names start with a number

I'm needing to work with tables whose names start with numbers. For example, in the crs_1973 schema there is a table called 2015_04_21. I know that when the table name is made up of numbers, I must ...
3
votes
1answer
1k views

PostgreSQL SELECT primary key as “serial” or “bigserial”

I've meshed together a way to determine what the data_type is as in the data_type you use in the syntax when creating a new table based off of the PostgreSQL wiki page. If there is something wrong ...
0
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0answers
15 views

How to use Domains in oracle database

I am trying to learn about domains. As far as i understand, domains are user defined "types" that describe restrictions of its value. But how would i assign and use a domain in a given table in an ...
9
votes
3answers
22k views

What is the benefit of using BOOLEAN over TINYINT(1)?

From MySQL manual, it says: BOOL, BOOLEAN These types are synonyms for TINYINT(1). A value of zero is considered false. Nonzero values are considered true: I created a BOOLEAN column with ...
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0answers
38 views

Do relational databases typically understand '1' and '0' as booleans?

I'm working on a code library that helps users build database searches from form inputs (a layer on top of an ORM). I want it to be compatible with most relational databases. I currently have a ...
8
votes
1answer
219 views

PostgreSQL bytea vs smallint[]

I'm looking to import large (100Mb -- 1 GB) multi-channel time-series data into a PostgreSQL database. The data comes from EDF format files that chunks the data into "records" or "epochs" of typically ...
-4
votes
1answer
54 views

How does Oracle handle types in this UNION query? [closed]

SELECT 1 FROM DUAL UNION SELECT '2' FROM DUAL; what does this give? knowing dual is default table and is a single row table. update: I fixed it with SELECT 1 FROM DUAL UNION SELECT CAST( '2' ...
4
votes
3answers
3k views

MySQL datatype for username of maximum 15 characters

I currently have a database with the "user" table having username as one of the columns. I allow a maximum of 15 characters for the username in my system. Is it fine to have the username column as a ...
1
vote
1answer
38 views

Advantages of POINT over DOUBLE for distance queries?

I'm about to start an application that will need a simple distance query to order results. After some search I've discovered some functions that seems to do this work pretty easily without needing ...
3
votes
1answer
1k views

Why 't' and 'f' instead of TRUE and FALSE

Why does PostgreSQL return 't' and 'f' instead of TRUE and FALSE? The documentation itself advises us to use TRUE and FALSE when inserting boolean values or making comparisons, but returns a ...
1
vote
1answer
118 views

VARCHAR2 should perhaps be DT_WSTR when working with SSIS against a Oracle Database?

When using SSIS with Oracle database, it seems to always assume that a VARCHAR2 maps to a DT_STR. However, if my Oracle encoding is set to AL32UTF8, I should be able to store any unicode character in ...
0
votes
1answer
378 views

Oracle NVARCHAR2(4000) with AL32UTF8 possible?

I thought, through reading items here and elsewhere, that if my Oracle database NLS_CHARACTERSET is set to AL32UTF8, I can have a column of type NVARCHAR2(4000), but when I try to create it, I get SQL ...
0
votes
1answer
43 views

Array of strings when updating a field

Unintentionally discovered that following query works in PostgreSQL: UPDATE "sometable" SET "somefield" = ('string1', 'string2') WHERE "id" = 1; I'm passing an array of strings to field and the ...
2
votes
1answer
288 views

Add column with a sum total to crosstab() query in PostgreSQL 9.0

Following on from my previous question: Creating crosstab() pivot table in PostgreSQL 9.0 I managed to create a pivot table for ageband using the crosstab() function. I can use this to either create ...
1
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0answers
47 views

MATLAB® export double numbers into PostgreSQL by `datainsert` (of Database Toolbox)

How is it possible to pass double numers into numeric postgreSQL columns from MATLAB? Here the list of matlab data: var1 197x1 cell var2 197x1 double var3 197x2 double var4 197x2 double ...
0
votes
1answer
36 views

SQLite Data Types In Context of Disk Space

I would like to better understand which data types in SQLite take up more disk space. I've looked through official documentation but could not find anything in context of storage space. Any guide ...
28
votes
6answers
41k views

In what data type should I store an email address in database?

I understand that an 254 character email address is valid, but implementations I have researched tend to use a varchar(60) to varchar(80) or equivalent. For example: this SQL Server recommendation ...
19
votes
7answers
10k views

Storing IP address

I have to store the IP address of all registered users in the database. I am wondering, how many characters should I declare for such a column? Should I support IPv6 as well? If so, what is the ...
1
vote
1answer
244 views

How to use timestamp/rowversion data types in Visio?

I am using Visio 2010 to create a ER diagram. When I insert the column names, I can't find timestamp or rowversion data types. Is there an alternative?
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1answer
42 views

Modulo operator with nonintegers - unexpected results

MySQL 5.5.32, Oracle 11g MySQL returns strange results for queries involving mod() with noninteger moduli. Why is this? I have a column defined thus: ...
3
votes
1answer
948 views

SELECT in trigger function in two tables

My table and trigger in PostgreSQL 9.4.3 on x86_64-unknown-linux-gnu, compiled by gcc (Debian 4.9.2-10) 4.9.2, 64-bit: CREATE TABLE measurements ( measurement_id SERIAL PRIMARY KEY NOT NULL, ...
5
votes
2answers
2k views

How to best store a timestamp in PostgreSQL?

I'm working on a PostgreSQL DB design and I am wondering how best to store timestamps. Assumptions Users in different timezones will use the database for all CRUD functions. I have looked at 2 ...
3
votes
1answer
145 views

Slow window function query with big table

I'm doing some performance testing on a new DB design on PostgreSQL 9.4rc1 and I'm seeing some pretty slow queries using window functions. Here is my table setup: CREATE TABLE player_stat ( ...
1
vote
1answer
283 views

pg_restore warning column X has type unknown

I'm doing a dump from PostgreSQL 9.1 and restoring on PostgreSQL 9.4 and getting this warning pg_restore: WARNING: column "foobar" has type "unknown" DETAIL: Proceeding with relation creation ...
1
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1answer
268 views

MySQL 5.6 Datetime Range

According to MySQL 5.6 doc, the supported range for datetime data type is '1000-01-01 00:00:00' to '9999-12-31 23:59:59'. But when I tried inserting values that are earlier than '1000-01-01 00:00:00', ...
1
vote
1answer
125 views

What is the best SQL Server field type to cast to when storing a UNC path stored in a sql_variant field?

What is the best choice of field type to cast to when storing a UNC path in a sql_variant in Microsoft SQL Server 2008? It appears that I could store up to 4000 characters according to Microsoft ...
1
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0answers
26 views

Uninitialized values: ignore or set?

From the implementation point of view for a database, is it preferable to handle optional form fields by setting to some default value (e.g. false, 0, "", etc.) or just ignore such fields (do nothing ...
2
votes
0answers
47 views

Is there a way to determine if a postgres function depends on a user-defined type?

I am writing a Ruby script to handle functions and user-defined types in Postgres. I want to make sure, that before a function is created in the database, if it uses a user-defined type, than this ...
6
votes
1answer
669 views

MySQL loading NULLs in numeric columns

MySQL 5.6.23, InnoDB I am loading tables from character delimited text files using the LOAD DATA INFILE commnd and I would like every field with a \N, which is the NULL character in this setting, to ...
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1answer
71 views

Is there a data type in MySQL similar to varchar(n) that not allow numbers or special characters in it?

Is there a data type in MySQL similar to varchar(n) that not allow numbers or special characters in it?
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2answers
511 views

SQL Server BigInt vs Decimal

I need to choose a data type for SQL Server( BigInt vs Decimal) on the basis of performance and querying (10 digit number)
7
votes
2answers
2k views

Single data type for imprecise date values, as allowed by ISO 8601

How can I store date and time values with reduced precision in a PostgreSQL type, and have them behave as date and/or time values? ISO 8601 allows date values with reduced precision. ‘1964’, ...
0
votes
2answers
284 views

change column type from string to numeric

so I have a table with 5.2 million records. 3 columns in this table are for salaries. Those column are currently stored as string and I'd like to change the data type to numeric (I understood while ...
0
votes
0answers
1k views

Blob datatype issue with log file

I am getting continuously below error message in mysqld.log [ERROR] InnoDB: The total blob data length (10152274) is greater than 10% of the redo log file size (3072). Please increase ...
2
votes
1answer
62 views

Is there any point in specifying the precision and scale of a number for a foreign key?

I am running Oracle 11gR2 11.2.0.3. I have two tables: table1 contains a column named SUBJECT_ID, whose datatype is NUMBER(7,0) (numbers range from 13 to 48480) table2 contains a a column named ...
4
votes
3answers
482 views

Unknown returned type in PostgreSQL query

The following query works: SELECT a, b FROM unnest(ARRAY[(1,2), (3,4)]) AS t(a integer, b integer); a b _ _ 1 2 3 2 However, I wasn't able to use a different column type such as varchar(255): ...
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0answers
196 views

Decimal Data Type as Primary Key

One of my tables is set up like this: create table dbo.Source ( testID decimal (10,3) PRIMARY KEY , column 2 somedatatype , column 3 somedatatype ) Whenever I perform SSIS into this table ...
0
votes
1answer
151 views

PostgreSQL column for year

I want to save the year in a PostgreSQL database - just the year. How should I create this field? There is a lot of information out there how I can extract the year from a date field, but not on how I ...
0
votes
2answers
198 views

Why is Oracle's number datatype so HUGE? and why do I seem to have no alternatives?

Oracle has a favorite numerical class called NUMBER. It is a 22 byte value that just seems ludicrous in an index. I have some values that would easily fit in a 6 byte integer and would therefore fit ...
0
votes
2answers
113 views

Query that was working on MySQL is not working on PostgreSQL

I had the following query (with bin_number being a string) which was working on MySQL 5.5: Postgres - was working on MySQL and doesn't work on PostgreSQL SELECT "menu_items".* FROM "menu_items" ...
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vote
1answer
58 views

Warehouse Database Design Question

Apologies if this has been answered previously but I have been unable to get a specific model to work. I have a database table that needs to store some very basic info for a reporting system. The ...
3
votes
1answer
927 views

Cannot SUM datetime field in SQL Server migrated from Access

I am new here and am new to SQL Server (Express). I used the SSMA tool and it converted Access date/time fields to datatime2. The data contains duration data so there is no need for a date. I want to ...
2
votes
3answers
515 views

Help me to map Column types betwenn SQL and TopSpeed Clarion Tables

I am tasked to convert an old Clarion App to new one under SQL Server 2012. All I have is 200 tables with TPS extension which I can open only by program called TopScan. (No odbc, no technical ...
3
votes
2answers
270 views

Moving data from table with VARCHAR(50) fields to table with numeric fields increases table size

I want to understand why migrating data in a table with all VARCHAR(50) fields to a table with optimized smaller types caused the new table (containing 61,065,164 rows) to be 4.46 GB, which is larger ...
0
votes
1answer
3k views

Storing latitude and longitude

I know there are similar questions on here that have been answered but unfortunately none of them work for me. I am hacking my way through creating a page which will display multiple locations on a ...
1
vote
2answers
8k views

work with json in oracle

Is there an easy way to work with JSON within Oracle? I have a stored procedure that I use to call web services quite often, JSON is a format that I am familiar with in web development context, but ...