Questions tagged [datatypes]

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

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PostgreSQL extending a variable-width bit string type?

PostgreSQL supports Bit Strings, SELECT B'01010101', B'01010101', '01010101'::bit(8), X'CC'; ?column? | ?column? | bit | ?column? ----------+----------+----------+---------- 01010101 | ...
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In PostgreSQL, what is the behavior of the bit(n) -> “char” cast?

Using PostgreSQL if I cast 65::bit(8)::"char" I get 0, if I however cast 65::bit(8)::int::"char" I get A as I would expect. SELECT v, v::bit(8)::"char" AS noint, v::bit(8)::int::"char" AS "...
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Having issues in assigning mysql datatypes

I am working first time with database. I had never inserted data into database. I want to insert below csv into mysql database. But I facing issues with data types. What type of data type I should ...
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SQLite text columns

When having a table in SQLite that has a TEXT data type, is there any implication if the length of the contained string differ significantly?
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2answers
4k views

Excel Import ID, Data Type Double

I get a file from another department that contains an id column. The id column is mostly numbers, but also contains some letters. I receive the file in XLS format. When I try to use the import ...
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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 ...
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3answers
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How can I cast to a user-defined type in SQL Server?

SQL Server provides an ability to create a user defined type with CREATE TYPE CREATE TYPE foo FROM int NOT NULL ; However, there is no mention how I construct a value with that type. Is this of use ...
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1answer
3k views

Can we use Varchar for columns that will save only numbers [closed]

I am doing a "user registration project" and I am newbie in database design. I studied a lot of tutorials, but I didn't get a solution for this question. Why there is not one particular datatype for ...
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1answer
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What is the optimal data type for columns that retain dates, DATE or INTEGER? [closed]

In my experience, old school thinking tells that, for optimal performance, date data points should be stored as an INTEGERs (e.g., as in 20160101), since they are manipulated faster, accelerate ...
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1answer
414 views

'INTERVAL' is not a recognized ODBC date/time extension option

According to this docs on Interval Literals, this should be a valid INTERVAL, SELECT {INTERVAL '326' YEAR(4)}; But when I try that on dbfiddle, I get, Msg 155 Level 15 State 1 Line 1 'INTERVAL' is ...
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1answer
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JSON vs Record/Struct type in a DB

It seems like some databases have implement a Record/Struct type and others have implemented a Json/Jsonb type to handle nested data structures. A few examples being: BigQuery Struct CockroachDB ...
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1answer
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how to get content from a TEXT column in mysql? [closed]

maybe dumb question but if I have a table with a MEDIUMTEXT column how do I query that table and see what the actual content is? eg SELECT text FROM PRIMARY_TEXT WHERE id = 1. What I get back now is [...
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1answer
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MySQL - Optimize a table which has mostly text data type

I recently faced some performance issue on a CMS based application. I can somehow fix other tables. But Im not able to optimize the table which has 40+ columns and 10 columns are having text as the ...
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1answer
1k views

Recommended datatype fixed length in mysql

What's the best data type for store fix length data such as MD5 password 1f3870be274f6c49b3e31a0c6728957f HEX Ccolor f2a709 They don't need character sets. All in absolute [a-z0-9]{6} for color, [a-...
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1answer
25 views

Creating blog fresh tables from old tables [closed]

I am re-creating a database structure from old tables. New tables should be optimized and easy to understand. In old database the developer used video table name for storing video blogs. However I ...
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1answer
64 views

Text storage for mysql

So I want to create a command like first_name VARCHAR(30) NOT NULL, ... however I want the database to hold more characters like a text storage type. How would I set up the command for the text type?
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1answer
2k views

Multiple conditions in a derived column ssis

Hi I am trying fairly new to SSIS , and my task is to convert dates in string as given below to a datetime. These are my date of birth in the source file (string data type): Source date of birth (...
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1answer
85 views

Why do we have Geometric Datatypes in SQL databases? [closed]

What is the purpose of a specific SDI datatypes in SQL tables? They could be represented as "(3,1)" (in case of point on a plane) VARCHAR and then retrieved by the application and processes them? What ...
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1answer
1k views

Why can't a function that accepts an int, be overloaded to accept an interval?

Currently getting an error about type casts, HINT: Could not choose a best candidate function. You might need to add explicit type casts. Let's say I create an overloaded function foo CREATE ...
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1answer
90 views

What is TRANSFORM FOR TYPE?

PostgreSQL 11 introduces TRANSFORM FOR TYPE, from these docs by HP, PostgreSQL 11 New_Features postgres=# CREATE EXTENSION jsonb_plperl CASCADE ; NOTICE: installing required extension "plperl" CREATE ...
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1answer
11k views

What are performance benefits when using number type instead of using char/varchar?

From various posts, I have summarized about using number type instead of char/varchar for PK: If you choose char/varchar type for PK and your values are short (just some alpha numberic codes) then it ...
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1answer
82 views

Dynamic table names [closed]

I am trying to create dynamic table names for each month. This is how I tried it: declare @query varchar(max) declare @i date declare @tableid int declare @tblname varchar(20) ...

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