MySQL :: SELECT COUNT(*) Or SELECT .. LIMIT 1?

Select Count() And LIMIT?
SELECT * FROM ...LIMIT 5, 10

But what if I want the total rows? I don't want to make another query without the limit. I just want this one query to return the total rows if I didn't put the LIMIT in there.

Posted: Mar 8 10 at 9:50

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Select Count With Limit Clause
trying to use count() statement to find duplicate content before insert new data into table... to do that I am using the following statement.

$query = "SELECT COUNT(*) AS total FROM table where picturelink='$picturelink[$i]'";

$result = mysql_query($query, $db);
$resrow = mysql_fetch_row($result);
$duplicate_check[$i] = $resrow[0];

As my database are getting bigger the select count statement taking longer time than I accepted ... and taking high cpu load.. So I planed to use

Limit clause with id desc .. as I wanted if the data is not duplicate withing last 5000 items , it could be proceed

So I write down following

$query = "SELECT COUNT(*) AS total FROM table where picturelink='$picturelink[$i]' Order By Id Desc Limit 0, 5000";

$result = mysql_query($query, $db);
$resrow = mysql_fetch_row($result);
$duplicate_check[$i] = $resrow[0];

But Limit clause having no effect on query... So please advice How I can use limit clause in select count or how I can optimize this whole statement to find out duplicate content before insert

Posted: November 30th, 2008, 12:48 PM

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Count All Rows When Using SELECT With LIMIT In Query?
I've got a mysql query like this:

SELECT A.ID, A.NAME, B.ID, B.NAME
FROM table1 A
JOIN table2 B ON ( A.ID = B.TABLE1_ID )
WHERE
cond1, cond2, ..., condN
LIMIT 10

I've got many where clauses in query. How to improve this query to get also full row count? I don't want to use one more request without LIMIT.

Posted: Mar 13 10 at 20:00

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Limit The Column Count At A SELECT Query?
Limit the column count at a SELECT query. This should be possible independent of the column names.

# Table Structure

id | k1 | k2 | [...] | k255

# Temporarily Solution

$query = "SELECT 'k1' [...] 'k10' FROM `$table`;

Posted: January 16, 2010 02:22PM

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Get Result Row Count For Individual SELECT Statements With UNION ALL When Using LIMIT?
I need to get the row count for individual SELECT statements in an UNION ALL SELECT query that uses LIMIT. The MySQL docs are pretty clear about getting the global row count for the query (place individual SELECTs in parenthesis and place an SQL_CALC_FOUND_ROWS only in the first statement, then get FOUND_ROWS() the usual way). However, I also need the result row count for the individual SELECT statements. The query, simplified:

(SELECT SQL_CALC_FOUND_ROWS `field1`,`field2` FROM `db`.`table1` WHERE `id`>1000)
UNION ALL
(SELECT `field1`,`field2` FROM `db`.`table2` WHERE `id`>1000)
UNION ALL
...
(SELECT `field1`,`field2` FROM `db`.`tableN` WHERE `id`>1000)
LIMIT 0,10

If SQL_CALC_FOUND_ROWS is placed in every SELECT statement an "Incorrect usage/placement of 'SQL_CALC_FOUND_ROWS'" error is issued.Google this a lot, read related messages here, to no avail.

Posted: Aug 23 09 at 10:08

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Select Into Outfile, Select Data Amount (file Size Limit)?
I am selecting huge amounts of data (~ 10-100 mbytes) from 400M-1G tables, I am using query:

select log from logs_010110 where [cond] into outfile '/tmp/log.txt'

the problem is - /tmp/log.txt file size EVERY time is 14134375 bytes == 15Mb so I think there is some limit for select statement which I need to override to select big amounts of data. What variable controls this limit/how can I set it bigger?

Posted: Mar 13 at 12:50

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Select Order By Nested Select Count?
Here's what I have (but it doesn't work )

$sql = mysql_query("SELECT * FROM post_text WHERE id IN (SELECT DISTINCT regarding FROM like_system) ORDER BY (SELECT regarding, count(*) AS bishbash FROM like_system GROUP BY regarding)");

I've simplified it down (it usually includes some NOT INs and stuff to hide blocked users, deleted, banned etc)

What this should be doing is:

Get all posts which someone likes - and display by number of how many times someone likes it. So basically sort by popularity, but only display each post once not each time someone's liked it.

Posted: April 15th, 2010, 07:13 PM

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Combine Select And Select Count Statement Together
how I can combine a select and select count statement together. I need to select fields from one table and count the number of records in another table using one of the fields from the first table's results. My table structure is as follows:

Trackchasers contains the following fields:
1. cid
2. cfn
3. ccitty
4. rgid
5. ctid

Both the trackchasers and trackvisits tables share the cid field. I am able to execute queries individually to get some of the data I need, however, I need to combine these queries if possible so it is easier to work with in PHP. My selection query:

select cid, cfn, cln, ccity, rgid, ctid from trackchasers
My count query:
select count(cid) as trackvisits from trackvisits where cid=12;

How can I combine these two statements to display all the fields I need plus the counting code? I tried using an inter join query

Posted: January 14, 2011, 11:24:20 AM

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Join 2 Statement Select - Select Count?
table: postid|userid|post|replyto

post sql
SELECT * FROM table WHERE postid=12
total replies sql
SELECT COUNT(*) AS total FROM table WHERE replyto=12

the expected result is the "post table" + how many replies to the post. replyto field is the target postid. somehing like :

postid|userid|post|replyto|totalreplies Is there a possibility to join this 2 queries?

Posted: Sep 30 09 at 7:21

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Count(*) In A Select Returns "1". It Should Behave Like Select Count(*)
i'm trying to make a query work properly but I got lost:

SELECT *,count(*)
FROM cancons c, musics m, discos d, r_discos_cancons rdc
WHERE c.c_id_music = m.m_id
AND rdc.rdc_id_disc = d.d_id
AND d.d_id_music = m.m_id
AND m.m_id = 24
GROUP BY c_id

note:
cancons (ca) = songs (en)
discos (ca) = cd's (en)
music (ca) = musician (en)

don't worry for the WHERE part. i need it because of the foreign keys.
this query returns a table with the title of the song and some more data. on the right side, I get another column called "count(c_id)" with the number "1" in it for each row. That's supposed to be due to the "group by" clause, I think.

I'd like to get the table with the songs, as usual, and, with the same query, I'd like to get the total number of rows selected.

Posted: September 15, 2007 12:55PM

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SELECT Without Specifying LIMIT
mysql version: 3.23.58 (i have to live with it, my customer's IT Manager is a stubborn donkey)it took me a while to figure that out, but my script fails because it is actually selecting too many data at the same time apparently.so if i do a "SELECT id FROM myTableWithManyRows" the page returns blank (no error displayed )

but if i do "SELECT id FROM myTableWithManyRows LIMIT 0,1000" it works.

but i need to be able to select 5000 records at once (only their id) !!

Is there a setting i can change in mysql or php in order to make this work?

Posted: October 11th, 2005, 07:42 AM

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How To LIMIT Within A Select
is there anyway to set limits within ONE select query?

SELECT * FROM my_table WHERE
(date = '123') <<< SET A LIMIT of 4 here.
OR
(name = 'sun') << SET A LIMIT of 3 here.

I know that it's possible to break this into 2 SELECTS and UNION them. But is there a way to keep 1 query, and set limits between the "ORs"?

Posted: April 26, 2009, 09:47:52 PM

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INSERT From The SELECT Cmd - Column Count Doesn't Match Value Count At Row 1
I am doing following INSERT from the SELECT cmd. but i am getting error "Column count doesn't match value count at row 1".

INSERT INTO tars (id_t, prefix_t, des_t, voice_T, from_t, to_t, from_ht,
to_hot, grace_t, minimal_t, reso_t)
VALUES(790,
(select prefix_t, des_t, voice_T from tars where id_t = 789)
, 0,6,0,2400,0,1,1);

Posted: November 09, 2009 08:52AM

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Select From Two Tables And Count And Order By Count Total?
table A structure id a1 a2 table B structure id time b1 b2 table A data

1 .. ..
2 .. ..
3 .. ..

table B data

1 129873635 blah blah
2 129880006 blah blah
2 129890676 blah blah
3 129973635 blah blah
2 129973635 blah blah
3 129936350 blah blah
2 129973635 blah blah
1 129873835 blah blah

I want to select from tablea and also tableb where tablea.id=tableb.id and count tableb where time > x order by count of tableb..

I want results like

2 blah blah (which has 4 row in table B)
1 blah blah (which has 2 row in table B)
3 blah blah (which has 2 row in table B)

Posted: Mar 11 at 9:18

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SELECT And LIMIT Question
I have multiple queries like this:

SELECT col1, col2, col3, col4 FROM table1, table2
where table1.col1 = table2.col1 and table1.col2 = 1
ORDER BY col3 desc LIMIT 5

and

SELECT col1, col2, col3, col4 FROM table1, table2
where table1.col1 = table2.col1 and table1.col2 = 2
ORDER BY col3 desc LIMIT 5

The only difference is in the WHERE clause table1.col2
= x.

I would like to have one statement instead of multiple
statements and though about using IN clause like:

SELECT col1, col2, col3, col4 FROM table1, table2
where table1.col1 = table2.col1 and table1.col2 IN
(1,2,3) ORDER BY col3 desc LIMIT 5

It works without LIMIT, but I need to use the LIMIT.

Posted: July 20th, 2005 12:31 AM

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Select Query Using Limit
i have the basic sql query as follows:

$sql = "select * from photo where CategoryId='$idc' order by Id limit $start, 9";

this will select all rows from db photo based on CategoryId, then stop after it gets the 9 beginning at $start right?

start is the value of the ID i want to start the select from. in this example, i have valid db values ranging from id: 11-20. the 1st page that runs this query has start=11, and displays for 11-19. when i goto the next page setting start=20, i get nothing. Limit returns 9 rows starting at $start right? or am i misunderstanding how all this works?

Posted: March 14th, 2005, 02:26 PM

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Limit The LAST Lines Of Select
I need to get only the last x lines from a select query (maybe 10 lines out of some 100's).

How can I simulate the LIMIT clause for this purpose?

My query:
SELECT *
FROM table1
WHERE account_id = 3 AND user_id = "username"
ORDER BY mail_time;

Posted: August 16, 2006 01:51PM

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SELECT With More LIMIT Options ? How ?
I have two elements : one with cars and other with boats - in the same table.
I want to make one select statement that returns the first 7 cars ( random selected ) and another 3 boats ( random selected ).
I am searching from 2 days.

Posted: Sep 28, 2007, 05:19

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LIMIT 1 On SELECT Query Using PK?
SELECT field1, field2
FROM table
WHERE id = 10
LIMIT 1

and id is a primary key, is the LIMIT 1 useful?In other words, when searching a primary key index, does mysql automatically stop the search when it finds the first matching record even when you don't use a LIMIT clause?

Posted: Sep 11, 2010, 12:07

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Select From 4 Categories Using LIMIT?
I have a forum app, like vbulletin. I would store the threads in THREADS table and THREADS table will have forum_id field that would tie it with the FORUMS table. Now I want to display 4 blocks on home page, each block is the latest 10 posts from 4 different forums.I also want to select forum titles, so I can use them in block titles. the forum titles are store in FORUMS table, of cause.Is there a way to select the 40 rows from THREADS table in one SQL select for that?

Posted: Mar 11, 2010, 15:54

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Select MAX Or Order By Limit 1
MIN/MAX vs ORDER BY and LIMIT To follow up on this question: I found some results very different from what Sean McSomething describes: I have a table with about 300M rows.

Select max(foo) from bar; takes about 15 sec. to run
Select foo from bar order by foo desc limit 1; takes 3 sec. to run

Sean's statement "It looks like MIN() is the way to go - it's faster in the worst case, indistinguishable in the best case" just doesn't hold for this case. Can anyone offer an explanation? Edit: Since I am unable to show the table's structure here: assume that bar is a table in an ndb_cluster with no relations, foo is an arbitrary data point with no index.

Posted: Nov 11 10 at 17:28

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SELECT Problem Using GROUP BY And LIMIT
I have a SELECT that returns with multiple records - It works when I have a
LIMIT clause but when I try to include a GROUP BY clause, the select returns
nothing (ie no records, no errors).

The GROUP BY specifies a column that does exist in my db (and is also the
only field that is select from the db).

Where am I going wrong? Because my select uses hashes (which I provide with
PHP - they are not created by MySQL) I've tried to simplify my query below,
keeping the statements the same but my values abbrieviated. Code:

Posted: July 19th, 2005 11:30 PM

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LIMIT Clause :: Select From Another Table
I need to retrived a specific row from a query, these these specific
row number is the result of another query.

Is it possible to do that in one query with a subquery (mysql 4.1.x)?
Here is how I try (that gave me a syntax error.):

SELECT a FROM t1 WHERE a = 1 ORDER BY LIMIT (SELECT b FROM t2 WHERE c
= 2),1;

############
the 2 query standalone worked.

SELECT b FROM t2 WHERE c = 2; # return 3

So:
SELECT a FROM t1 WHERE a = 1 ORDER BY LIMIT 3,1; # return the good row

Posted: July 20th, 2005 12:37 AM

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SELECT COUNT(*) Or SELECT .. LIMIT 1?

If the purpose of a query is to see if atleast 1 record exists which would be faster? SELECT COUNT(*) or SELECT .. LIMIT 1? Both would use a WHERE clause.

If the purpose of a query is to see if atleast 1 record exists which would be faster?

SELECT COUNT(*) or SELECT .. LIMIT 1?

Both would use a WHERE clause.