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

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4
votes
3answers
5k views

How to change the datatype of a column from integer to money?

I am attempting to convert a PostgreSQL table column from integer to money, but I am receiving the error: cannot cast type MyColumn to money I have tried these two statements, but just haven't ...
4
votes
1answer
13k views

PLS-00306 Error: How to find the wrong argument?

PLS-00306: wrong number or types of arguments in call to 'string' Cause: This error occurs when the named subprogram call cannot be matched to any declaration for that subprogram name. The ...
5
votes
2answers
1k 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’, ...
1
vote
1answer
353 views

Is it possible to fetch or update table data by table field type?

Is it possible to fetch or update table data by field type? If possible please tell me with a sample code.
2
votes
1answer
477 views

What are the pro's and con's of using PostgreSQL vs MySQL for binary data?

I read that MySQL has binary safe blobs, but PostgreSQL does not. So far what I've found suggests that "binary safe" is something that really relates to functions and handling of data, not the data ...
7
votes
1answer
2k views

Is there such thing as Custom Data Types?

Does MySQL have any support for custom data types? For example, zip codes might be stored in a varchar(10) field, but they could be compacted in to an int, with options for blank, and a flag as to ...
4
votes
0answers
155 views

Which SQL datatypes exist since when and in which RDBMS? [closed]

I found a general comparision of different SQL implementations that only covers some data types (BOOLEAN and TIMESTAMP) and a comparision of datat type support in different RDBMS from 2009 that does ...
11
votes
4answers
715 views

Does NULL have a type?

Various sources (eg Wikipedia, PSOUG) state that Oracle's null does not have a type. Is this true? What about other RDBMSs?
2
votes
2answers
605 views

PostgreSQL: Separate tables vs single table to perserve disk space?

I have 2 tables with the below schemas with equal number of rows. When I run the SELECT relname, relpages FROM pg_class ORDER BY relpages DESC command, they show up as 23GB each even though the data ...
3
votes
1answer
9k views

How can I convert from Double Precision to Bigint with PostgreSQL?

I need to convert a value of Double Precision to Bigint with PostgreSQL. How can I do that? I have tried with to_bigint(myvalue) but that function didn't exist.
4
votes
1answer
3k views

How to insert an IP-address into an inet column in PostgreSQL?

I would like to insert an IP-address into a column that has type inet. In what format can I insert the data? is it only binary or is there any way I can insert from text e.g. "192.168.1.082"? Are ...
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) ...
1
vote
1answer
884 views

How can I alter the type of a money-column to decimal in PostgreSQL?

I have a table in PostgreSQL where one column "vat" has type money but I would like to alter it to decimal instead. How can I do it? I tried with: alter table my_table alter column vat type ...
2
votes
1answer
1k views

Oracle implicit parameter casting - why doesn't it always work? (ORA-06502 error)

I have a Java (Spring) app that uses Oracle 10 as DB. Some legacy code has wrong parametrization of PL/SQL procedures. For instance, some input parameters are declared as OracleTypes.VARCHAR in Java ...
18
votes
7answers
7k views

How do long columns impact performance and disk usage?

In our current project it just happens too often, that we need to extend columns by a couple of characters. From varchar(20) to varchar(30) and so on. In reality, how much does it really matter? How ...
14
votes
6answers
5k 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 ...
13
votes
3answers
13k views

What is the difference between Oracle's VARCHAR and VARCHAR2 datatypes?

When migrating tables coming from other DBMSs to Oracle, one of the standard tasks is to replace all VARCHAR(n) fields with VARCHAR2(n) fields (provided n <= 4000). Why does Oracle call this ...
3
votes
3answers
1k 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 | ...
8
votes
3answers
4k views

MySQL data type for 128 bit integers

I need to store 128 bits unsigned integers into MySQL and I was wondering what is the best data type to store such big numbers. Right now, I'm using binary(16) but that involves a lot of conversion ...
6
votes
2answers
804 views

Get records between time span

I would like to retrieve records between time spans,All i have is this snippet of string indicating the time span 9:00 AM - 10:00 AM below is the table schema CREATE TABLE [dbo].[Samples]( [RID] ...
15
votes
5answers
6k views

Performance implications of MySQL VARCHAR sizes

Is there a performance difference in MySQL between varchar sizes? For example, varchar(25) and varchar(64000). If not, is there a reason not to declare all varchars with the max size just to ensure ...
14
votes
4answers
25k views

What is the difference between MySQL VARCHAR and TEXT data types?

After version 5.0.3 (which allowed VARCHAR to be 65,535 bytes and stopped truncating trailing spaces), is there any major difference between these two data types? I was reading the list of ...
12
votes
1answer
13k views

INT(5) vs SMALLINT(5)

In MySQL table definitions is there a different between INT(5) and SMALLINT(5)? Or do they both represent the same size?
20
votes
3answers
11k views

What are the drawbacks with using UUID or GUID as a primary key?

I would like to build a distributed system. I need to store data in databases and it would be helpful to use an UUID or a GUID as a primary key on some tables. I assume it's a drawbacks with this ...