What Is The Limit of The Field Type Bigint in Sql

What is the limit of the field type BIGINT in SQL?

Check the manual of the RDBMS you're using. It may not be the same in all systems.

MySQL:

https://dev.mysql.com/doc/refman/5.7/en/integer-types.html

PostgreSQL:

https://www.postgresql.org/docs/10/static/datatype-numeric.html

SQL Server (Transact-SQL):

https://learn.microsoft.com/en-us/sql/t-sql/data-types/int-bigint-smallint-and-tinyint-transact-sql

DB2:

http://publib.boulder.ibm.com/infocenter/dzichelp/v2r2/index.jsp?topic=/com.ibm.db29.doc.sqlref/db2z_biginteger.htm

Primary key id reaching limit of bigint data type

If you don't need that column because you have another identifier for a record which is unique. Like a supplied measurement_id or whatever or even a combined key: measurement_id + location_id it should not be needed to use an auto increment key. If there is any chance you won't have a unique key than make one for sure.

What if I need a very very big autoincrement ID?

Are you really sure you have so many inserts and deletes you will get to the limit?

Types in MySQL: BigInt(20) vs Int(20)

See http://dev.mysql.com/doc/refman/8.0/en/numeric-types.html

• INT is a four-byte signed integer.

• BIGINT is an eight-byte signed integer.

They each accept no more and no fewer values than can be stored in their respective number of bytes. That means 2³² values in an INT and 2⁶⁴ values in a BIGINT.

The 20 in INT(20) and BIGINT(20) means almost nothing. It's a hint for display width. It has nothing to do with storage, nor the range of values that column will accept.

Practically, it affects only the ZEROFILL option:

CREATE TABLE foo ( bar INT(20) ZEROFILL );
INSERT INTO foo (bar) VALUES (1234);
SELECT bar from foo;

+----------------------+
| bar                  |
+----------------------+
| 00000000000000001234 |
+----------------------+

It's a common source of confusion for MySQL users to see INT(20) and assume it's a size limit, something analogous to CHAR(20). This is not the case.

Is BIGINT(8) the largest integer MySQL can store?

The number represents how it's displayed - it doesn't affect how the data is stored.

From the manual:

Another extension is supported by MySQL for optionally specifying the display width of integer data types in parentheses following the base keyword for the type (for example, INT(4)). This optional display width may be used by applications to display integer values having a width less than the width specified for the column by left-padding them with spaces. (That is, this width is present in the metadata returned with result sets. Whether it is used or not is up to the application.)

The display width does not constrain the range of values that can be stored in the column, nor the number of digits that are displayed for values having a width exceeding that specified for the column. For example, a column specified as SMALLINT(3) has the usual SMALLINT range of -32768 to 32767, and values outside the range allowed by three characters are displayed using more than three characters.

A BIGINT is always 8 bytes and can store -9223372036854775808 to 9223372036854775807 (signed) or 0 to 18446744073709551615 (unsigned).

max value represented by bigint

See the answer provided in this similar question. There is no way, as far as I know, to programmatically find the answer you're looking for.

Based on the comments you posted on another answer, this would allow you to only have to change your values in one place, as opposed to multiple places.

Max Size of SQL Server Auto-Identity Field

An INT will take you up to 2,147,483,647.

A BIGINT will get you 9,223,372,036,854,775,807.

How can I set a size limit for an int datatype in PostgreSQL 9.5

I explicitly want to set a limit to the number of digits that can be inserted into the "pk_flat_id" field

Your current table definition does not impose a "size limit" in any way. In MySQL the parameter for the intdata type is only a hint for applications on the display width of the column when displaying it.

You can store the value 2147483647 in an int(1) without any problems.

If you want to limit the values to be stored in an integer column you can use a check constraint:

CREATE TABLE flat_10
(
  pk_flat_id bigint DEFAULT 1,
  rooms      integer NOT NULL,
  room_label CHAR(1) NOT NULL,

  PRIMARY KEY (flat_id), 
  constraint valid_number 
      check (pk_flat_id <= 999999999)
);

Upper limit for autoincrement primary key in SQL Server

Joel's answer is correct, it is the upper limit of whatever datatype you use.

Here's an example of two of them:

• int: 2^31-1 (2,147,483,647)
• bigint: 2^63-1 (9,223,372,036,854,775,807)

I have actually hit the limit at a job I worked at. The actual error is:

    Msg 8115, Level 16, State 1, Line 1
    Arithmetic overflow error converting IDENTITY to data type int.
    Arithmetic overflow occurred.

There are a couple fixes to this I can think of off the top of my head. Number 1 is probably very hard and not very likely, number 2 is easy, but will probably cause problems in your code base.

1. If the identity column doesn't matter to you (it's not a Foreign Key, etc.) then you can just reseed the database and reset the identity column.
2. Change your identity column to a bigger number. So for example if you've overflowed an int, change your identity column to a big int. Good luck overflowing that :)

There are probably other fixes, but there is no magic bullet easy one. I just hope this doesn't happen in a table that is the center of a bunch of relationships, because if it does, you're in for a lot of pain. It's not a hard fix, just a tedious and long one.

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