I have a mysql table with 2 entries (id ,title) (int, text)
A row of dummy data in the table looks like
id title
1 apple\"apple
My query intends to do a search on the field title
select * from table1 where title='apple\"apple';
I also tried using
select * from table1 where title like('apple\"apple');
The above query did not seem to work as well.
Both queries are returning an empty sets. Is it not possible to search for a string that has backslash in it?
PS :: The \ is added to the DB as part of escaping the double quotes.
Sure? It works as expected.
mysql> CREATE TABLE MyTbl (id INT, title TEXT);
Query OK, 0 rows affected (0.01 sec)
mysql> INSERT INTO MyTbl VALUES(1,'apple "apple');
Query OK, 1 row affected (0.00 sec)
mysql> SELECT * FROM MyTbl;
+------+-------------+
| id | title |
+------+-------------+
| 1 | apple"apple |
+------+-------------+
1 row in set (0.00 sec)
mysql> SELECT * FROM MyTbl WHERE title = 'apple \"apple';
+------+-------------+
| id | title |
+------+-------------+
| 1 | apple"apple |
+------+-------------+
1 row in set (0.00 sec)
mysql> SELECT * FROM MyTbl WHERE title like('apple \"apple');
+------+-------------+
| id | title |
+------+-------------+
| 1 | apple"apple |
+------+-------------+
1 row in set (0.00 sec)
Maybe Is it something related to the space character?
mysql> SELECT * FROM MyTbl WHERE title = 'apple\"apple';
Empty set (0.00 sec)
mysql> SELECT * FROM MyTbl WHERE title = 'apple \"apple';
+------+--------------+
| id | title |
+------+--------------+
| 1 | apple "apple |
+------+--------------+
1 row in set (0.00 sec)
What about running this command? What It returns for you?
mysql> SELECT #NO_BACKSLASH_ESCAPES;
+----------------------------------------------+
| #NO_BACKSLASH_ESCAPES |
+----------------------------------------------+
| NULL |
+----------------------------------------------+
1 row in set (0.00 sec)
Related
I created a column called oilcompany that has SET data (Hunt, Pioneer, Chevron, BP)
I can enter any one of those into the oilcompany column and change from one to another one but I can not figure out how to change from one oilcompany to multiple oilcompany (eg. Hunt and BP)... any suggestion?
In the MySQL documentation there are not examples for UPDATE statements, but I normally use two ways to update these kind of columns:
Using text values
Using numeric values
Creating the test environment
mysql> CREATE TABLE tmp_table(
-> id INT NOT NULL AUTO_INCREMENT PRIMARY KEY,
-> oilcompany SET('Hunt', 'Pioneer', 'Chevron', 'BP')
-> );
Query OK, 0 rows affected (0.54 sec)
mysql> INSERT INTO tmp_table(oilcompany) VALUES ('Hunt'), ('Pioneer');
Query OK, 2 rows affected (0.11 sec)
Records: 2 Duplicates: 0 Warnings: 0
mysql> SELECT * FROM tmp_table;
+----+------------+
| id | oilcompany |
+----+------------+
| 1 | Hunt |
| 2 | Pioneer |
+----+------------+
2 rows in set (0.00 sec)
Alternative#1: Using Text Values
As a SET is a collection of ENUM elements, and any ENUM element can be treated as a string, then we can do things like:
mysql> UPDATE tmp_table
-> SET oilcompany = 'Hunt,BP'
-> WHERE id = 1;
Query OK, 1 row affected (0.07 sec)
Rows matched: 1 Changed: 1 Warnings: 0
mysql> SELECT * FROM tmp_table;
+----+------------+
| id | oilcompany |
+----+------------+
| 1 | Hunt,BP |
| 2 | Pioneer |
+----+------------+
2 rows in set (0.00 sec)
Alternative#2: Using Numeric Values
Any SET element is stored internally as a 64bit number containing the combination of the bits that represent each SET element.
In our table: 'Hunt'=1, 'Pioneer'=2, 'Chevron'=4, 'BP'=8.
Also, mysql allows to use these numbers instead of text values. If we need to see the numeric value in the select, we need to use the SET column inside a numeric expression (E.g. adding zero).
Let's see the current values:
mysql> SELECT id, oilcompany+0, oilcompany FROM tmp_table;
+----+--------------+------------+
| id | oilcompany+0 | oilcompany |
+----+--------------+------------+
| 1 | 9 | Hunt,BP |
| 2 | 2 | Pioneer |
+----+--------------+------------+
2 rows in set (0.00 sec)
Here 9 = 'Hunt' (1) + 'BP' (8) and 2 = 'Pioneer' (2).
Now, let's change the Pioneer to 'Hunt' (1) + 'Chevron' (4):
mysql> UPDATE tmp_table
-> SET oilcompany = 5
-> WHERE id = 2;
Query OK, 1 row affected (0.08 sec)
Rows matched: 1 Changed: 1 Warnings: 0
mysql> SELECT id, oilcompany+0, oilcompany FROM tmp_table;
+----+--------------+--------------+
| id | oilcompany+0 | oilcompany |
+----+--------------+--------------+
| 1 | 9 | Hunt,BP |
| 2 | 5 | Hunt,Chevron |
+----+--------------+--------------+
2 rows in set (0.00 sec)
output mysql> insert into test (id,img)
values(1,LOAD_FILE('/home/ubundu/pic.jpg'));
Query OK, 1 row affected (0.55 sec)
mysql> select * from test;
+------+------+
| id | img |
+------+------+
| 1 | NULL |
+------+------+
1 row in set (0.02 sec)
I'm testing the InfiniDB community edition to see if it suits our needing.
I imported in a single table about 10 millions rows (loading of data was surprisingly fast), and I'm trying to do some query on it, but these are the results (with NON cached queries.. if query caching exists in InfiniDB):
Query 1 (very fast):
select * from mytable limit 150000,1000
1000 rows in set (0.04 sec)
Query 2 (immediate):
select count(*) from mytable;
+----------+
| count(*) |
+----------+
| 9429378 |
+----------+
1 row in set (0.00 sec)
Ok it seems to be amazingly fast.. but:
Query 3:
select count(title) from mytable;
.. still going after several minutes
Query 4:
select id from mytable where id like '%ABCD%';
+------------+
| id |
+------------+
| ABCD |
+------------+
1 row in set (11 min 17.30 sec)
I must be doing something wrong, it's not possible that it's performing this way with so simple queries. Any Idea?
That shouldn't be the case, there does appear to be something odd going on, see quick test below.
What is your server configuration: memory/OS/CPU and platform (dedicated, virtual, cloud).
Could I get the schema declaration and method to load the data?
Which version are you using? Version 4 community has significantly more features than prior versions, i.e. core syntax matches enterprise.
Cheers,
Jim T
mysql> insert into mytable select a, a from (select hex(rand() * 100000) a from lineitem limit 10000000) b;
Query OK, 10000000 rows affected (1 min 54.12 sec)
Records: 10000000 Duplicates: 0 Warnings: 0
mysql> desc mytable;
+-------+-------------+------+-----+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+-------+-------------+------+-----+---------+-------+
| id | varchar(32) | YES | | NULL | |
| title | varchar(32) | YES | | NULL | |
+-------+-------------+------+-----+---------+-------+
2 rows in set (0.01 sec)
mysql> select * from mytable limit 150000,1000;
+-------+-------+
| id | title |
+-------+-------+
| E81 | E81 |
| 746A | 746A |
. . .
| DFC8 | DFC8 |
| 2C56 | 2C56 |
+-------+-------+
1000 rows in set (0.07 sec)
mysql> select count(*) from mytable;
+----------+
| count(*) |
+----------+
| 10000000 |
+----------+
1 row in set (0.06 sec)
mysql> select count(title) from mytable;
+--------------+
| count(title) |
+--------------+
| 10000000 |
+--------------+
1 row in set (0.09 sec)
mysql> select id from mytable where id like '%ABCD%' limit 1;
+------+
| id |
+------+
| ABCD |
+------+
1 row in set (0.03 sec)
In MySQL I have some tables I need to randomize the phone numbers and Email addresses to be randomly generated for development purposes.
In MySQL how could I generate 7 digit unique random numbers for the phone numbers?
How can I generate random email address like 545165498#mailinator.com.
How can I generate this random data with MySQL Queries?
MySQL rand() Returns a random floating-point value in the range 0 <= value < 1.0.
Multiply that by another number: UPPER_BOUND and get the floor of that, and you will get a random integer between 0 and (UPPER_BOUND-1) like this:
SELECT floor(rand() * 10) as randNum;
That will give you only one random number between 0 and 10.
Change the 10 to the number one higher than you want to generate.
Something like this :
UPDATE user
SET email = CONCAT(FLOOR(rand() * 10000000),'#mailinator.com'),
PhoneNo = FLOOR(rand() * 10000000)
This should give you a random number of 7 digits length
SELECT FLOOR(1000000 + RAND() * 8999999)
And something like this should update your phone numbers and e-mail addresses according to your requirement
UPDATE Customers
SET phone = CAST(FLOOR(1000000 + RAND(8999999) AS VARCHAR),
email = CONCAT(CAST(FLOOR(1000000 + RAND(8999999) AS VARCHAR), '#mailinator.com')
MySQL Generate random data walkthrough:
Random number between 0 (inclusive) and 1 exclusive:
mysql> select rand();
+--------------------+
| rand() |
+--------------------+
| 0.5485130739850114 |
+--------------------+
1 row in set (0.00 sec)
Random int between 0 (inclusive) and 10 exclusive:
mysql> select floor(rand()*10);
+------------------+
| floor(rand()*10) |
+------------------+
| 6 |
+------------------+
1 row in set (0.00 sec)
Random letter or number:
mysql> select concat(substring('ABCDEF012345', rand()*36+1, 1));
+---------------------------------------------------------------------------+
| concat(substring('ABCDEF012345', rand()*36+1, 1)) |
+---------------------------------------------------------------------------+
| F |
+---------------------------------------------------------------------------+
1 row in set (0.00 sec)
Random letter a to z:
mysql> select char(round(rand()*25)+97);
+---------------------------+
| char(round(rand()*25)+97) |
+---------------------------+
| s |
+---------------------------+
1 row in set (0.00 sec)
Random 8 character alphanumeric string:
mysql> SELECT LEFT(UUID(), 8);
+-----------------+
| LEFT(UUID(), 8) |
+-----------------+
| c26117af |
+-----------------+
1 row in set (0.00 sec)
Random capital letter in MySQL:
mysql> select CHAR( FLOOR(65 + (RAND() * 25)));
+----------------------------------+
| CHAR( FLOOR(65 + (RAND() * 25))) |
+----------------------------------+
| B |
+----------------------------------+
1 row in set (0.00 sec)
Load a random row into a table:
mysql> create table penguin (id INT primary key auto_increment, msg TEXT);
Query OK, 0 rows affected (0.02 sec)
mysql> insert into penguin values (0, LEFT(UUID(), 8));
Query OK, 1 row affected (0.00 sec)
mysql> select * from penguin;
+------+----------+
| id | msg |
+------+----------+
| 0 | abab341b |
+------+----------+
1 row in set (0.00 sec)
Load random rows:
Make a procedure called dennis that loads 1000 random rows into penguin.
mysql> delimiter ;;
mysql> drop procedure if exists dennis;;
Query OK, 0 rows affected, 1 warning (0.00 sec)
mysql> create procedure dennis()
-> begin
-> DECLARE int_val INT DEFAULT 0;
-> myloop : LOOP
-> if (int_val = 1000) THEN
-> LEAVE myloop;
-> end if;
-> insert into penguin values (0, LEFT(UUID(), 8));
-> set int_val = int_val +1;
-> end loop;
-> end;;
Query OK, 0 rows affected (0.00 sec)
mysql> call dennis();;
mysql> select * from penguin;;
+------+----------+
| id | msg |
+------+----------+
| 0 | abab341b |
| 1 | c5dc08ee |
| 2 | c5dca476 |
...
+------+----------+
Update all rows in a table to have random data:
mysql> create table foo (id INT primary key auto_increment, msg TEXT);
Query OK, 0 rows affected (0.02 sec)
mysql> insert into foo values (0,'hi');
Query OK, 1 row affected (0.00 sec)
mysql> insert into foo values (0,'hi2');
Query OK, 1 row affected (0.00 sec)
mysql> insert into foo values (0,'hi3');
Query OK, 1 row affected (0.00 sec)
mysql> select * from foo;
+----+------+
| id | msg |
+----+------+
| 1 | hi |
| 2 | hi2 |
| 3 | hi3 |
+----+------+
3 rows in set (0.00 sec)
mysql> update foo set msg = rand();
Query OK, 3 rows affected (0.00 sec)
Rows matched: 3 Changed: 3 Warnings: 0
mysql> select * from foo;
+----+---------------------+
| id | msg |
+----+---------------------+
| 1 | 0.42576668451145916 |
| 2 | 0.6385560879842901 |
| 3 | 0.9154804171207178 |
+----+---------------------+
3 rows in set (0.00 sec)
Here is an online tool to generate random data with many options. http://www.generatedata.com/
Just enter the parameters to define what kind of random data you want, and export it to the appropriate format, then you can load it.
we have an issue because this is how the table was setup. How do we select from a table where a set does not contain a value? If we have a set with one,two and we do
SELECT *
FROM table
WHERE column NOT IN('one')
we will still get that row. What is the correct syntax for this?
Thanks
this is what worked:
SELECT *, FIND_IN_SET('hidden', props) As hidden
FROM gt_content
HAVING hidden IS NULL
Try:
SELECT *
FROM table
WHERE FIND_IN_SET('one',column) = 0
Some test I did:
mysql> CREATE TABLE setTest (s SET('a','b','c','d'));
Query OK, 0 rows affected (0.60 sec)
mysql> INSERT INTO setTest VALUES ('a'),('a,b'),('b'),('a,c'),('c,d');
Query OK, 5 rows affected (0.14 sec)
Records: 5 Duplicates: 0 Warnings: 0
mysql> SELECT * FROM setTest;
+------+
| s |
+------+
| a |
| a,b |
| b |
| a,c |
| c,d |
+------+
5 rows in set (0.20 sec)
mysql> SELECT * FROM setTest WHERE FIND_IN_SET('a',s) = 0;
+------+
| s |
+------+
| b |
| c,d |
+------+
2 rows in set (0.12 sec)
mysql> SELECT * FROM setTest WHERE FIND_IN_SET('b',s) = 0;
+------+
| s |
+------+
| a |
| a,c |
| c,d |
+------+
3 rows in set (0.00 sec)
mysql> SELECT * FROM setTest WHERE FIND_IN_SET('b',s) > 0;
+------+
| s |
+------+
| a,b |
| b |
+------+
2 rows in set (0.04 sec)
From the mysql manual at http://dev.mysql.com/doc/refman/5.0/en/set.html:
Normally, you search for SET values using the FIND_IN_SET() function or the LIKE operator:
SELECT * FROM tbl_name WHERE FIND_IN_SET('value',set_col)>0;
SELECT * FROM tbl_name WHERE set_col LIKE '%value%';
The first statement finds rows where set_col contains the value set member. The second is similar, but not the same: It finds rows where set_col contains value anywhere, even as a substring of another set member.