Questions tagged [datatypes]

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

Filter by
Sorted by
Tagged with
4
votes
1answer
2k views

Postgresql numeric and decimal is automatically rounding off

CREATE TABLE IF NOT EXISTS ttable ( tcol decimal(9,7) ); insert into ttable(tcol) values(17.4604786); the value is getting stored as 17.46 Happens the same if I use decimal/numeric type I am ...
4
votes
3answers
8k views

What data type should I use: ENUM, TINYINT, or CHAR?

I'm creating a new table and I would like to do it right. The table will be a list of members with their Professional Type and Decile associated. The Professional Type is a 3-character string. There ...
4
votes
2answers
579 views

Different syntax to add/substract interval

Till now I used the following syntax to add an interval to a timestamp: select now() + '5 year'; This worked fine till I tried to subtract the interval which results in a syntax error. invalid ...
4
votes
1answer
9k views

How to convert _id field of all existing documents from type String to Number

At one of my collections I have an _id field that stores numbers. The field was defined originally in the Mongoose model as String. However, all the data concerning this field in the collection ...
4
votes
2answers
739 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 ...
4
votes
3answers
3k views

Can MariaDB or MySQL cast as bigint, getting an error: … right syntax to use near 'bigint)'?

If I want to take a string and create a table (this fails in strict mode), CREATE TABLE g AS SELECT CAST('2147483699' AS int); How do I tell it that I want a bigint type? I'll also get an int(10) ...
4
votes
1answer
2k views

Why does a JSON element return text when it's not text?

When I try to access a JSON element using ->>'elementName' I get a texttype. SELECT pg_typeof(x1->>'a'), jsonb_typeof(x2) FROM ( VALUES ('{"a":5}'::jsonb, '5'::jsonb) ) AS t(x1,x2); ...
4
votes
1answer
6k views

Untyped functions that return tables

I would like to write a PostgreSQL stored function that essentially behaves like the stored procedures I know and love from MSSQL and MySQL where I can just wrap a query that takes no parameters and ...
4
votes
1answer
155 views

According to the SQL92 spec, can I store the value 1 in a field where the precision = scale?

Is it SQL92 compliant to store the number 1 in a field that is defined as NUMERIC 3,3? What about DECIMAL 3,3? Does this mean that the precision is a floating decimal place or static that must ...
4
votes
2answers
2k views

Change column data type across database

I have a bunch of tables with many columns of data type ntext. I wish to change all such columns in all tables of a particular database to nvarchar(max), because of planned deprecation (EDIT: also ...
4
votes
1answer
5k views

Use array_position() function to get the most frequent value for column from pg_stats

I'm trying to execute this simple query in order to check whether some value (1000) belongs to MCV list used by Postgres query optimizer: SELECT array_position(most_common_vals, 1000) FROM pg_stats ...
4
votes
1answer
1k views

Why does using a Real data type in a mathematical equation return an incorrect result?

I was trying to figure out the source of what appeared to be a rounding error today, and discovered that one of the columns used in a mathematical equation was using the real data type, and this is ...
4
votes
1answer
3k views

SQL Server - storing ulong as primary key

I need to store ulong values as a primary key in SQL Server. Since SQL Server doesn't have a ulong datatype (or for that matter anything unsigned), the only way to go is to have column as varbinary(8)....
4
votes
1answer
249 views

Data type for a fuzzy date?

I want to store partial information related to a date. I might know the year and month but not the day. I might know the day and month but not the year. I might know the date lies in an open or closed ...
4
votes
2answers
10k views

How can I define the datatype of a view in MySQL?

I've written a simple aggregation view over a table, and the view returns different data types that the table. This causes some issues on the application side. Here's a simplified query for the sake ...
4
votes
2answers
177 views

MySQL is trimming my numbers and I can't figure out why

I've got a table with a bunch of decimal(12,2) fields that are supposed to hold money amounts. For some reason which I can't figure out one of them is trimming the value when either inserted or ...
4
votes
1answer
8k views

Rich text: VARCHAR, TEXT or BLOB in MySQL

Question: In my web application (php/MySQL) I will be saving rich text. This may be anything from a couple words to several pages length essay. I’m sure I could get away with using VARCHAR, TEXT or ...
4
votes
1answer
298 views

How to set constraints on UDT in SQL Server 2005 - 2012

I'm creating my UDT: CREATE TYPE [dbo].[Code] FROM VARCHAR(20) NOT NULL As RULES and DEFAULTS are considered deprecated, what is the recommended way to set constraint on my type to make sure that ...
4
votes
0answers
1k views

How do I convert cents retained as integers to dollars as decimals?

I have cent values, retained as integers, that I need to convert to dollars and show them as a decimals. Example A value is kept as 1925, so I need to be able to return 19.25. This is what I had ...
3
votes
2answers
11k views

Which data type should I use to store a 11 digit number [closed]

Which data type I should use to store an 11 digit number? It must store '0' as the first digit. For example, if I store 02421402015, it must show 02421402015. I tried using varchar and it shows ...
3
votes
6answers
840 views

Database with only text fields

I started working on an existing SQL Server Database System in which most of the fields are stored as text. Except some IDs all fields are varchar (phone numbers, zip codes, dates, addresses, monetary ...
3
votes
2answers
6k views

Changing data type from mediumint to int without downtime

My current table is using MEDIUMINT for ID column ‘primary key auto increment’. The current table records soon will reach the maximum value for mediumint which is 8388607. That being the case, I need ...
3
votes
1answer
131k views

Float datatype with 2 digits after decimal point

In SQL server float datatype does not display trailing zeros after decimal point declare @num as float set @num=5.20 select @num will dispaly only 5.2 But i want it to display as 5.20 After a ...
3
votes
3answers
2k views

Why is XML taking up more storage than VARCHAR(MAX)?

We have large tables storing XML data as varchar(MAX). The data is for reference/historical purposes, it's not queried. Based on what I've read, storing as XML datatype instead of VARCHAR(MAX) should ...
3
votes
2answers
1k views

Most efficient data type for a column storing numeric values between 0 and 100

On my MySQL DB I was thinking of using TINYINT (Unsigned)? Would you use Byte on SQL Server?
3
votes
1answer
6k 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 ...
3
votes
2answers
8k 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)
3
votes
2answers
895 views

How to save an interval of years in postgresql

I have to save an interval of years, like: id intervalYears 1 2014/2015 2 2015/2016 3 2016/2017 And so on. Those years are like accademic years, so the first year must be lesser then the second, ...
3
votes
1answer
3k views

PostgreSQL 9.2 number of days in a tstzrange?

How can the number of days contained within a range be found? For example, with these timestamp ranges, get these (integer) number of days: tstzrange('2013-10-01 07:00', '2013-10-01 07:15') | 1 (day)...
3
votes
3answers
226 views

How to restrict sequence like ID type to C type like int64_t, uint64_t, int32_t?

In C99 I can be pretty clear about the size/domain of an integer type. When interfacing a SQL database like Oracle or Postgresql from a C program I want to create a table with integer types that ...
3
votes
2answers
10k views

what is bigger than a longblob?

the longblob is the biggest data type of Mysql. If I want to save something bigger than 4gb (longblob) how can I do?. I'm talking about Mysql v-5.+
3
votes
2answers
1k views

Mapping SQL Server integer to Oracle Datatype

Well I know, that an SQL Server integer is best represented by NUMBER(10). But sometimes I have migrate some maintenance scripts to Oracle and I wonder if I must carefully map integer to NUMBER(10) ...
3
votes
1answer
210 views

What's the difference between equality (=) and inequality (<>) on BIT field in SQL Server?

Is there difference between WHERE [BitField] = 1 and WHERE [BitField] <> 0? They seem logically equivalent. SQL Server, however, disagrees and creates slightly different execution plans. (Which ...
3
votes
1answer
124 views

Definition of indexing, datatype configuration, and DBMS for SHA3-256 hashes

I am designing a system within which I will need to be able to search a database using a file or string SHA3-256 hash. For example the hash of test is ...
3
votes
1answer
1k views

Why is my database 12 times bigger than inserted data?

I have a short question concerning my database size. I need to insert data in a database. Before the insert, some calculations need to be done. The point is: from 50 mb plain data (~700,000 lines), ...
3
votes
1answer
3k views

Find current owner of custom data type?

In Postgresql, when I try to run ALTER TYPE x ADD VALUE y; on a custom datatype I get an error stating PG::Error: ERROR: must be owner of type x. I know this can be solved by running ALTER TYPE x ...
3
votes
1answer
10k views

Why does Oracle store time in DATE column?

I have a table with a date column. I used JDBC to save a java.util.Date object into the table. When I run following query I get date aswell as a time value: select To_CHAR(departure_date,'DD-MM-YYYY ...
3
votes
2answers
270 views

Are mime types only for file storage? [closed]

If I have a plain-text field on a web form (not a file upload) inserting its content into my table, would it be wrong for me to set a mime type 'text' to it, or would it be safer?
3
votes
1answer
30 views

Postgres varchar(100)[] -> text[] column conversion

I need to change a column type from varchar(100)[] to text[]. The table has >100M rows and heavy write load, so I'd like to avoid taking an access exclusive lock and rewriting the index. I saw in ...
3
votes
2answers
234 views

Why database has char data type when varchar is more efficient?

I understand the basic difference between CHAR and VARCHAR datatype that CHAR takes up fixed length whereas VARCHAR takes up space based on the content being stored. But if VARCHAR is so efficient in ...
3
votes
2answers
87 views

How to store values that include numbers and strings? Example: 1.25, trace, not applicable, etc

I created a database for nutritional table information. This database have values like carbohydrates, protein and fats of a food (there is a total of 28 fields). The problem is that there are special ...
3
votes
1answer
878 views

Why does a table of varchar(255) columns take up less space than an identical table using the correct data types

I have two tables that are identical and hold the same rows of data. one uses a varchar(255) for every column of the table, the other is correctly typed for each column (using date, int, decimal etc.)...
3
votes
1answer
1k 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 ...
3
votes
3answers
2k views

Estimate large database size and speed

First I want to know how to estimate the database size regarding the biggest table it will contains. I've the following : +----------+------------------+------+-----+---------+-------+ | Field | ...
3
votes
4answers
27k views

Converting columns from NVARCHAR to VARCHAR

I have several large tables with many NVARCHAR(MAX) columns. This database is only for US use and I don't think there are any foreign characters or letters in any of the columns, so I wanted to look ...
3
votes
1answer
2k views

Convert varchar column to inet

I have a table column containing IP addresses, datatype is varchar(255). I want to switch to inet datatype now. Is there a way to convert existing addresses in IP column to inet datatype? Tried: ...
3
votes
1answer
1k views

Where to find the size of SQL Server data types?

This question has already been asked here but none of the answers was really helpful in finding out the size for example, of a XML variable. declare @myVariable XML I have learned from this question:...
3
votes
1answer
10k views

Handling sql column with mixed varchar and float data types

We have some Excel spreadsheets with parcel numbers for properties that should be in a standard varchar format similar to: [Parcel # 1] [Building Address] 038-60-171-16-000 1750 W 4th St ...
3
votes
1answer
2k 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 ...
3
votes
1answer
822 views

Use of integer instead of interval (of one type)

Our DB design presently has a interval column which will only be storing days (no other interval type) so it is making sense to use INT2 (smallint) instead of interval. Reference to documentation. ...

1 2 3
4
5
10