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The FOUND_ROWS SQL Function in MySQL and MariaDB - Number of rows after SELECT

FOUND_ROWSSyntax:FOUND_ROWS()
Return value:INTEGER
Function type:Information function
Function Description

The FOUND_ROWS() function returns either the number of rows from a result of a SELECT statement, or the number of possible rows using the SELECT option SQL_CALC_FOUND_ROWS if the SELECT statement without LIMIT clause would be executed.

The FOUND_ROWS() function also works with other statements that return result sets, including SHOW, DESC and HELP.

Statements without result sets do not affect FOUND_ROWS(). The previous value is then returned. If there is no previous value, 0 is returned.

After a CALL statement, this function returns the number of rows selected by the last query in the procedure.

SQL Examples for the FOUND_ROWS function

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select found_rows();

select `Name`,`css`,`link`,`typ` from `asysfonts` limit 10;
select found_rows();

select SQL_CALC_FOUND_ROWS `Name`,`css`,`link`,`typ` from `asysfonts` limit 10;
select found_rows();
select count(*) from `asysfonts`;


show charset;
select found_rows();
found_rows()
bigint(21)
0
Name
css
link
typ
varchar(50) LATIN1varchar(255) LATIN1varchar(50) LATIN1varchar(20) LATIN1
ArialArial sans-serif
Helvetica"Helvetica Neue" sans-serif
VerdanaVerdana, Geneva, sans-serif sans-serif
Times New Roman"Times", Times, san-serif sans-serif
Courier (Monospace)Courier, monospace monospace
Lucida Console (Monospace)"Lucida Console", Courier, monospace monospace
Cursivecursive handwriting
Fantasyfantasy  
Goudy Bookletter 1911"Goudy Bookletter 1911", sans-serif sans-serif
Gill Sans ExtraboldGill Sans Extrabold, sans-serif sans-serif
found_rows()
bigint(21)
10
Name
css
link
typ
varchar(50) LATIN1varchar(255) LATIN1varchar(50) LATIN1varchar(20) LATIN1
ArialArial sans-serif
Helvetica"Helvetica Neue" sans-serif
VerdanaVerdana, Geneva, sans-serif sans-serif
Times New Roman"Times", Times, san-serif sans-serif
Courier (Monospace)Courier, monospace monospace
Lucida Console (Monospace)"Lucida Console", Courier, monospace monospace
Cursivecursive handwriting
Fantasyfantasy  
Goudy Bookletter 1911"Goudy Bookletter 1911", sans-serif sans-serif
Gill Sans ExtraboldGill Sans Extrabold, sans-serif sans-serif
found_rows()
bigint(21)
847
count(*)
bigint(21)
847
Charset
Description
Default collation
Maxlen
information_schema.CHARACTER_SETS
CHARACTER_SET_NAME
varchar(32) UTF8		information_schema.CHARACTER_SETS
DESCRIPTION
varchar(60) UTF8		information_schema.CHARACTER_SETS
DEFAULT_COLLATE_NAME
varchar(32) UTF8		information_schema.CHARACTER_SETS
MAXLEN
bigint(3)
big5Big5 Traditional Chinesebig5_chinese_ci2
dec8DEC West Europeandec8_swedish_ci1
cp850DOS West Europeancp850_general_ci1
hp8HP West Europeanhp8_english_ci1
koi8rKOI8-R Relcom Russiankoi8r_general_ci1
latin1cp1252 West Europeanlatin1_swedish_ci1
latin2ISO 8859-2 Central Europeanlatin2_general_ci1
swe77bit Swedishswe7_swedish_ci1
asciiUS ASCIIascii_general_ci1
ujisEUC-JP Japaneseujis_japanese_ci3
sjisShift-JIS Japanesesjis_japanese_ci2
hebrewISO 8859-8 Hebrewhebrew_general_ci1
tis620TIS620 Thaitis620_thai_ci1
euckrEUC-KR Koreaneuckr_korean_ci2
koi8uKOI8-U Ukrainiankoi8u_general_ci1
gb2312GB2312 Simplified Chinesegb2312_chinese_ci2
greekISO 8859-7 Greekgreek_general_ci1
cp1250Windows Central Europeancp1250_general_ci1
gbkGBK Simplified Chinesegbk_chinese_ci2
latin5ISO 8859-9 Turkishlatin5_turkish_ci1
armscii8ARMSCII-8 Armenianarmscii8_general_ci1
utf8UTF-8 Unicodeutf8_general_ci3
ucs2UCS-2 Unicodeucs2_general_ci2
cp866DOS Russiancp866_general_ci1
keybcs2DOS Kamenicky Czech-Slovakkeybcs2_general_ci1
macceMac Central Europeanmacce_general_ci1
macromanMac West Europeanmacroman_general_ci1
cp852DOS Central Europeancp852_general_ci1
latin7ISO 8859-13 Balticlatin7_general_ci1
utf8mb4UTF-8 Unicodeutf8mb4_general_ci4
cp1251Windows Cyrilliccp1251_general_ci1
utf16UTF-16 Unicodeutf16_general_ci4
utf16leUTF-16LE Unicodeutf16le_general_ci4
cp1256Windows Arabiccp1256_general_ci1
cp1257Windows Balticcp1257_general_ci1
utf32UTF-32 Unicodeutf32_general_ci4
binaryBinary pseudo charsetbinary1
geostd8GEOSTD8 Georgiangeostd8_general_ci1
cp932SJIS for Windows Japanesecp932_japanese_ci2
eucjpmsUJIS for Windows Japaneseeucjpms_japanese_ci3
found_rows()
bigint(21)
40
The examples were created with the MyWAY SQL manager: Download

How to use the FOUND_ROWS() function in MySQL and MariaDB databases

In MySQL and MariaDB the FOUND_ROWS() function is used to count the number of result rows of a SQL Query to retrieve, or the number of result rows that would be returned by a SELECT query without the LIMIT clause. This can also be used to determine the total number of result rows that match a given condition, even if the original query uses the LIMIT clause to limit the number of rows returned. The function requires no arguments and is usually called immediately after executing a SELECT query, or a SELECT query using the LIMIT clause used with SQL_CALC_FOUND_ROWS option.

Using SQL_CALC_FOUND_ROWS and FOUND_ROWS() together can have an impact on performance, especially with large tables, because the database first must calculate the total number of matching rows before applying the LIMIT clause.

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More information about the FOUND_ROWS SQL function: mysql.com and mariadb.com
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