Whats the size of an SQL Int(N)?
It depends on the database. MySQL has an extension where INT(N) means an INT with a display width of 4 decimal digits. This information is maintained in the metadata.
The INT itself is still 4 bytes, and values 10000 and greater can be stored (and probably displayed, but this depends how the application uses the result set).
What is the size of column of int(11) in mysql in bytes?
An INT will always be 4 bytes no matter what length is specified.
TINYINT= 1 byte (8 bit)SMALLINT= 2 bytes (16 bit)MEDIUMINT= 3 bytes (24 bit)INT= 4 bytes (32 bit)BIGINT= 8 bytes (64 bit).
The length just specifies how many characters to pad when selecting data with the mysql command line client. 12345 stored as int(3) will still show as 12345, but if it was stored as int(10) it would still display as 12345, but you would have the option to pad the first five digits. For example, if you added ZEROFILL it would display as 0000012345.
... and the maximum value will be 2147483647 (Signed) or 4294967295 (Unsigned)
What is the maximum size of int(10) in Mysql
INT(10) means you probably defined it as INT UNSIGNED.
So, you can store numbers from 0 up to 4294967295 (note that the maximum value has 10 digits, so MySQL automatically added the (10) in the column definition which (10) is just a format hint and nothing more. It has no effect on how big number you can store).
You can use BIGINT UNSIGNED if you want to store bigger values. See the MySQL docs: Integer Types (Exact Value)
Length of integer in SQL (i.e. length of decimal string)
On my machine versions 2 and 3 come out about equal and beat the other two.
Edit: Though it has just occurred to me that my original test was a bit unfair on CASE as ordering the statements in ascending numerical order means that only 10 possible numbers would meet the first condition and exit early. I've added an additional test below. You might also try nesting CASE statements to do a binary search.
SET NOCOUNT ON
SET STATISTICS TIME ON
PRINT 'Test 1';
WITH E00(N) AS (SELECT 1 UNION ALL SELECT 1),
E02(N) AS (SELECT 1 FROM E00 a, E00 b),
E04(N) AS (SELECT 1 FROM E02 a, E02 b),
E08(N) AS (SELECT 1 FROM E04 a, E04 b),
E16(N) AS (SELECT 1 FROM E08 a, E08 b),
E32(N) AS (SELECT 1 FROM E16 a, E16 b),
cteTally(N) AS (SELECT ROW_NUMBER() OVER (ORDER BY N) FROM E32)
SELECT MAX(FLOOR(LOG10(N))+1)
FROM cteTally
WHERE N <= 10000000;
PRINT 'Test 2';
WITH E00(N) AS (SELECT 1 UNION ALL SELECT 1),
E02(N) AS (SELECT 1 FROM E00 a, E00 b),
E04(N) AS (SELECT 1 FROM E02 a, E02 b),
E08(N) AS (SELECT 1 FROM E04 a, E04 b),
E16(N) AS (SELECT 1 FROM E08 a, E08 b),
E32(N) AS (SELECT 1 FROM E16 a, E16 b),
cteTally(N) AS (SELECT ROW_NUMBER() OVER (ORDER BY N) FROM E32)
SELECT MAX(LEN(CONVERT(VARCHAR, N)))
FROM cteTally
WHERE N <= 10000000;
PRINT 'Test 3';
WITH E00(N) AS (SELECT 1 UNION ALL SELECT 1),
E02(N) AS (SELECT 1 FROM E00 a, E00 b),
E04(N) AS (SELECT 1 FROM E02 a, E02 b),
E08(N) AS (SELECT 1 FROM E04 a, E04 b),
E16(N) AS (SELECT 1 FROM E08 a, E08 b),
E32(N) AS (SELECT 1 FROM E16 a, E16 b),
cteTally(N) AS (SELECT ROW_NUMBER() OVER (ORDER BY N) FROM E32)
SELECT MAX(LEN(CAST(N AS VARCHAR(10))))
FROM cteTally
WHERE N <= 10000000;
PRINT 'Test 4';
WITH E00(N) AS (SELECT 1 UNION ALL SELECT 1),
E02(N) AS (SELECT 1 FROM E00 a, E00 b),
E04(N) AS (SELECT 1 FROM E02 a, E02 b),
E08(N) AS (SELECT 1 FROM E04 a, E04 b),
E16(N) AS (SELECT 1 FROM E08 a, E08 b),
E32(N) AS (SELECT 1 FROM E16 a, E16 b),
cteTally(N) AS (SELECT ROW_NUMBER() OVER (ORDER BY N) FROM E32)
SELECT MAX(CASE
WHEN N < 10 THEN 1
WHEN N < 100 THEN 2
WHEN N < 1000 THEN 3
WHEN N < 10000 THEN 4
WHEN N < 100000 THEN 5
WHEN N < 1000000 THEN 6
WHEN N < 10000000 THEN 7
WHEN N < 100000000 THEN 8
END)
FROM cteTally
WHERE N <= 10000000;
PRINT 'Test 5';
WITH E00(N) AS (SELECT 1 UNION ALL SELECT 1),
E02(N) AS (SELECT 1 FROM E00 a, E00 b),
E04(N) AS (SELECT 1 FROM E02 a, E02 b),
E08(N) AS (SELECT 1 FROM E04 a, E04 b),
E16(N) AS (SELECT 1 FROM E08 a, E08 b),
E32(N) AS (SELECT 1 FROM E16 a, E16 b),
cteTally(N) AS (SELECT ROW_NUMBER() OVER (ORDER BY N) FROM E32)
SELECT MAX(CASE
WHEN N >= 100000000 THEN NULL
WHEN N >= 10000000 THEN 8
WHEN N >= 1000000 THEN 7
WHEN N >= 100000 THEN 6
WHEN N >= 10000 THEN 5
WHEN N >= 1000 THEN 4
WHEN N >= 100 THEN 3
WHEN N >= 10 THEN 2
ELSE 1
END )
FROM cteTally
WHERE N <= 10000000;
Results from an example run on my machine are
Test 1
CPU time = 9422 ms, elapsed time = 9523 ms.
Test 2
CPU time = 7021 ms, elapsed time = 7130 ms.
Test 3
CPU time = 6864 ms, elapsed time = 7006 ms.
Test 4
CPU time = 9328 ms, elapsed time = 9456 ms.
Test 5
CPU time = 6989 ms, elapsed time = 7358 ms.
int(11) vs. int(anything else)
The x in INT(x) has nothing to do with space requirements or any other performance issues, it's really just the display width. Generally setting the display widths to a reasonable value is mostly useful with the UNSIGNED ZEROFILL option.
//INT(4) UNSIGNED ZEROFILL
0001
0002
...
0099
...
0999
...
9999
...
10000
//INT(2) UNSIGNED ZEROFILL
01
02
...
09
...
99
...
100
Without the UNSIGNED ZEROFILL option the value will be left-padded with spaces to the appropriate display width.
//INT(4)
1
2
...
99
...
999
...
9999
...
10000
//INT(2)
1
2
...
9
...
99
...
100
Types in MySQL: BigInt(20) vs Int(20)
See http://dev.mysql.com/doc/refman/8.0/en/numeric-types.html
INTis a four-byte signed integer.BIGINTis 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.
Where to find the size of SQL Server data types
Your can use below query :
SELECT * FROM sys.types
result of above query is below :
name system_type_id user_type_id schema_id principal_id max_length precision scale collation_name is_nullable is_user_defined is_assembly_type default_object_id rule_object_id is_table_type
-------------------- -------------- ------------ --------- ------------ ---------- --------- ----- ----------------- ----------- --------------- ---------------- ----------------- -------------- -------------
image 34 34 4 NULL 16 0 0 NULL 1 0 0 0 0 0
text 35 35 4 NULL 16 0 0 Persian_100_CI_AI 1 0 0 0 0 0
uniqueidentifier 36 36 4 NULL 16 0 0 NULL 1 0 0 0 0 0
date 40 40 4 NULL 3 10 0 NULL 1 0 0 0 0 0
time 41 41 4 NULL 5 16 7 NULL 1 0 0 0 0 0
datetime2 42 42 4 NULL 8 27 7 NULL 1 0 0 0 0 0
datetimeoffset 43 43 4 NULL 10 34 7 NULL 1 0 0 0 0 0
tinyint 48 48 4 NULL 1 3 0 NULL 1 0 0 0 0 0
smallint 52 52 4 NULL 2 5 0 NULL 1 0 0 0 0 0
int 56 56 4 NULL 4 10 0 NULL 1 0 0 0 0 0
smalldatetime 58 58 4 NULL 4 16 0 NULL 1 0 0 0 0 0
real 59 59 4 NULL 4 24 0 NULL 1 0 0 0 0 0
money 60 60 4 NULL 8 19 4 NULL 1 0 0 0 0 0
datetime 61 61 4 NULL 8 23 3 NULL 1 0 0 0 0 0
float 62 62 4 NULL 8 53 0 NULL 1 0 0 0 0 0
sql_variant 98 98 4 NULL 8016 0 0 NULL 1 0 0 0 0 0
ntext 99 99 4 NULL 16 0 0 Persian_100_CI_AI 1 0 0 0 0 0
bit 104 104 4 NULL 1 1 0 NULL 1 0 0 0 0 0
decimal 106 106 4 NULL 17 38 38 NULL 1 0 0 0 0 0
numeric 108 108 4 NULL 17 38 38 NULL 1 0 0 0 0 0
smallmoney 122 122 4 NULL 4 10 4 NULL 1 0 0 0 0 0
bigint 127 127 4 NULL 8 19 0 NULL 1 0 0 0 0 0
hierarchyid 240 128 4 NULL 892 0 0 NULL 1 0 1 0 0 0
geometry 240 129 4 NULL -1 0 0 NULL 1 0 1 0 0 0
geography 240 130 4 NULL -1 0 0 NULL 1 0 1 0 0 0
varbinary 165 165 4 NULL 8000 0 0 NULL 1 0 0 0 0 0
varchar 167 167 4 NULL 8000 0 0 Persian_100_CI_AI 1 0 0 0 0 0
binary 173 173 4 NULL 8000 0 0 NULL 1 0 0 0 0 0
char 175 175 4 NULL 8000 0 0 Persian_100_CI_AI 1 0 0 0 0 0
timestamp 189 189 4 NULL 8 0 0 NULL 0 0 0 0 0 0
nvarchar 231 231 4 NULL 8000 0 0 Persian_100_CI_AI 1 0 0 0 0 0
nchar 239 239 4 NULL 8000 0 0 Persian_100_CI_AI 1 0 0 0 0 0
xml 241 241 4 NULL -1 0 0 NULL 1 0 0 0 0 0
sysname 231 256 4 NULL 256 0 0 Persian_100_CI_AI 0 0 0 0 0 0
CalculatedCreditInfo 243 257 9 NULL -1 0 0 NULL 0 1 0 0 0 1
udt_QoutaDetail 243 258 21 NULL -1 0 0 NULL 0 1 0 0 0 1
BeforeUpdate 243 259 22 NULL -1 0 0 NULL 0 1 0 0 0 1
udt_StoreInventory 243 260 26 NULL -1 0 0 NULL 0 1 0 0 0 1
udt_WKFHistory 243 261 32 NULL -1 0 0 NULL 0 1 0 0 0 1
IDTable 243 262 1 NULL -1 0 0 NULL
you can use max_length for size of each data type.
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)
);
MySql: Tinyint (2) vs tinyint(1) - what is the difference?
It means display width
Whether you use tinyint(1) or tinyint(2), it does not make any difference.
I always use tinyint(1) and int(11), I used several mysql clients (navicat, sequel pro).
It does not mean anything AT ALL! I ran a test, all above clients or even the command-line client seems to ignore this.
But, display width is most important if you are using ZEROFILL option, for example your table has following 2 columns:
A tinyint(2) zerofill
B tinyint(4) zerofill
both columns has the value of 1, output for column A would be 01 and 0001 for B, as seen in screenshot below :)
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