I have the following four tables in my database:
+--------------+-------------+------+-----+---------+----------------+
| Field | Type | Null | Key | Default | Extra |
+--------------+-------------+------+-----+---------+----------------+
| complex_id | int(11) | NO | PRI | NULL | auto_increment |
| complex_name | varchar(45) | NO | | NULL | |
+--------------+-------------+------+-----+---------+----------------+
+--------------+-------------+------+-----+---------+----------------+
| Field | Type | Null | Key | Default | Extra |
+--------------+-------------+------+-----+---------+----------------+
| machine_id | int(11) | NO | PRI | NULL | auto_increment |
| complex_id | int(11) | NO | MUL | NULL | |
| machine_name | varchar(45) | NO | | NULL | |
+--------------+-------------+------+-----+---------+----------------+
+-----------------+--------------+------+-----+---------+----------------+
| Field | Type | Null | Key | Default | Extra |
+-----------------+--------------+------+-----+---------+----------------+
| devices_id | int(11) | NO | PRI | NULL | auto_increment |
| machine_id | int(11) | NO | MUL | NULL | |
| description | varchar(255) | NO | | NULL | |
| location | varchar(255) | YES | | NULL | |
| verification | varchar(255) | YES | | NULL | |
| rack_num | varchar(8) | YES | | NULL | |
| section_num | varchar(8) | YES | | NULL | |
| color_or_number | varchar(16) | YES | | NULL | |
| normal_position | varchar(16) | YES | | NULL | |
+-----------------+--------------+------+-----+---------+----------------+
+------------+-------------+------+-----+---------+----------------+
| Field | Type | Null | Key | Default | Extra |
+------------+-------------+------+-----+---------+----------------+
| pnp_id | int(11) | NO | PRI | NULL | auto_increment |
| devices_id | int(11) | NO | MUL | NULL | |
| pnp_num | varchar(45) | NO | | NULL | |
+------------+-------------+------+-----+---------+----------------+
I am trying to get results formatted as follows (NULL values appear as blanks):
+------------+-------------+-----------------------+
| devices_id | description | pnpnum |
+------------+-------------+-----------------------+
| 1 | ex | 1234 |
| 2 | ex2 | 2345 |
| 3 | ex3 | |
| 4 | ex4 | 3456, 4567, 5678, 6879|
+------------+-------------+-----------------------+
Using the following SQL query,
SELECT *, GROUP_CONCAT(pnp.pnp_num separator ', ') pnpnum
FROM devices
JOIN pnp ON devices.devices_id = pnp.devices_id
WHERE devices.machine_id = 1
GROUP BY devices.devices_ID
ORDER BY devices.description;
my results are relatively close, however, I am unable to include a device if it has a null pnpnum.
+------------+-------------+-----------------------+
| devices_id | description | pnpnum |
+------------+-------------+-----------------------+
| 1 | ex | 1234 |
| 2 | ex2 | 2345 |
| 4 | ex4 | 3456, 4567, 5678, 6879|
+------------+-------------+-----------------------+
What is it that I am missing from my SQL statement that will allow me to include null values?
You need to use LEFT JOIN because even if there isn't a match, it will return all the results from the left table leaving the fields from the right table null.
Related
I have a table with the following structure:
+-----------------+--------------+------+-----+-------------------+-----------------------------+
| Field | Type | Null | Key | Default | Extra |
+-----------------+--------------+------+-----+-------------------+-----------------------------+
| imovel_id | int(11) | NO | PRI | NULL | auto_increment |
| user_id | int(11) | NO | | NULL | |
| img_dest | varchar(111) | YES | | NULL | |
| data_imob | timestamp | NO | | CURRENT_TIMESTAMP | on update CURRENT_TIMESTAMP |
| finalidade_imob | varchar(51) | NO | MUL | NULL | |
| status_imob | varchar(51) | NO | | NULL | |
| tipo_imob | varchar(255) | YES | | NULL | |
| uf_imob | varchar(51) | NO | MUL | NULL | |
| cidade_imob | varchar(255) | NO | | NULL | |
| bairro_imob | varchar(255) | YES | | NULL | |
| rua_imob | varchar(255) | YES | | NULL | |
| vaga_imob | varchar(255) | YES | | NULL | |
| dorms_imob | char(2) | YES | | NULL | |
| tamanho_imob | varchar(222) | YES | | NULL | |
| valor_imob | varchar(255) | YES | | 0 | |
| titulo_imob | varchar(255) | YES | | NULL | |
| descricao_imob | longtext | YES | | NULL | |
| carac_imob | varchar(255) | YES | | NULL | |
+-----------------+--------------+------+-----+-------------------+-----------------------------+
If I run this query:
SELECT * FROM form_imovel LEFT JOIN (form_user) ON (form_user.user_id = form_imovel.user_id) WHERE MATCH(finalidade_imob,status_imob,tipo_imob,uf_imob,cidade_imob,bairro_imob,dorms_imob,valor_imob) AGAINST ('Comprar' IN BOOLEAN MODE);
Where Comprar is the value from finalidade_imob column, I have the right results, that work with all columns, except uf_imobcolumn.
The uf_imobcolumns have values like: SP,MG,RJ.
If I try run the following query, it returns empty:
SELECT * FROM form_imovel LEFT JOIN (form_user) ON (form_user.user_id = form_imovel.user_id) WHERE MATCH(finalidade_imob,status_imob,tipo_imob,uf_imob,cidade_imob,bairro_imob,dorms_imob,valor_imob) AGAINST ('SP' IN BOOLEAN MODE);
Even though that column has so many SP registers.
Fiddle example
I want to be able to select classes that are starting on or after the next two hours up until the end of tomorrow's date but I am not sure of how to do this.
My current sql is below, I have only been able to select classes that are after today's date and after the current time. I want to be able to only return classes that start two hours after now up until the end of tomorrows date.
I am able to pass the current date and current time into my node.js function that will construct the sql statement. Also, I have access to moment.js library if I need to use this I could.
Any help would be appreciated.
SELECT DISTINCT b.name
, a.time
FROM class a
Inner join (SELECT class_id, count(clientid)
FROM bookings
GROUP BY class_id
HAVING count(clientid) < 10) as openClasses on
a.class_id = openClasses.class_id
JOIN class_detail b
ON a.class_id = b.id
JOIN branch c
ON a.branch_id = c.id
WHERE c.level <= ( SELECT d.level
FROM client d
WHERE d.facebook_id = 'xxxxxx'
)
AND a.date = '2016-08-17'
AND a.time >= '13.00.00';
My tables are as follows:
BOOKINGS
+-----------+-------------+------+-----+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+-----------+-------------+------+-----+---------+-------+
| id | bigint(20) | NO | PRI | NULL | |
| CLIENT_ID | int(11) | NO | | NULL | |
| CLASS_ID | int(11) | NO | | NULL | |
| STATUS | varchar(10) | NO | | NULL | |
+-----------+-------------+------+-----+---------+-------+
mysql> show fields from BRANCH;
+---------------------+-------------+------+-----+---------+----------------+
| Field | Type | Null | Key | Default | Extra |
+---------------------+-------------+------+-----+---------+----------------+
| id | int(10) | NO | PRI | NULL | auto_increment |
| NAME | char(50) | NO | | NULL | |
| CONTACT_NO | char(50) | YES | | NULL | |
| MAP_IMG_PATH | char(200) | YES | | NULL | |
| ADDRESS | char(200) | YES | | NULL | |
| LEVEL | int(2) | NO | | NULL | |
| LOCATION | int(10) | YES | | NULL | |
| SECTOR_NAME | varchar(45) | YES | | NULL | |
| SECTOR_MAP_IMG_PATH | char(200) | YES | | NULL | |
+---------------------+-------------+------+-----+---------+----------------+
mysql> show fields from CLIENT;
+--------------+-------------+------+-----+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+--------------+-------------+------+-----+---------+-------+
| id | int(10) | NO | PRI | NULL | |
| NAME | char(50) | NO | | NULL | |
| DOB | int(8) | NO | | NULL | |
| LOCAL_BRANCH | int(10) | YES | | NULL | |
| FACEBOOK_ID | char(50) | NO | | NULL | |
| START_DATE | int(8) | NO | | NULL | |
| EMAIL | char(50) | YES | | NULL | |
| PIN | int(4) | YES | | NULL | |
| END_DATE | int(8) | NO | | NULL | |
| LEVEL | int(2) | YES | | NULL | |
| TEL | varchar(20) | YES | | NULL | |
+--------------+-------------+------+-----+---------+-------+
mysql> show fields from CLASS_DETAIL;
+--------------+--------------+------+-----+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+--------------+--------------+------+-----+---------+-------+
| id | int(10) | NO | PRI | NULL | |
| NAME | char(50) | NO | | NULL | |
| DESCRIPTION | char(200) | NO | | NULL | |
| CATEGORY | varchar(4) | YES | | NULL | |
| ACHIEVE_TYPE | char(200) | YES | | NULL | |
| IMG_M | varchar(200) | YES | | NULL | |
| IMG_F | varchar(200) | YES | | NULL | |
+--------------+--------------+------+-----+---------+-------+
mysql> show fields from CLASS;
+-----------+---------+------+-----+---------+----------------+
| Field | Type | Null | Key | Default | Extra |
+-----------+---------+------+-----+---------+----------------+
| id | int(11) | NO | PRI | NULL | auto_increment |
| CLASS_ID | int(10) | YES | | NULL | |
| BRANCH_ID | int(10) | NO | | NULL | |
| DURATION | int(3) | YES | | NULL | |
| DATE | date | NO | | NULL | |
| TIME | time | NO | | NULL | |
| STATUS | char(1) | NO | | NULL | |
+-----------+---------+------+-----+---------+----------------+
7 rows in set (0.11 sec)
I have a MySQL database table, student_import_record, with a student_id varchar(50) field that can contain alphanumeric data.
When I run this SELECT statement:
select student_id from student_import_record;
I get the VARCHAR results as expected:
0001546
0001660
0002207
0002349
But when I run this SELECT statement with a WHERE clause:
select student_id from student_import_record where student_import_id = 185;
I get results that appear to be cast as an integer:
1546
1660
2207
2349
How do I prevent this casting when using a WHERE clause?
Full Table schema:
mysql> describe student_import_record;
+--------------------+--------------+------+-----+---------+----------------+
| Field | Type | Null | Key | Default | Extra |
+--------------------+--------------+------+-----+---------+----------------+
| id | int(11) | NO | PRI | NULL | auto_increment |
| student_id | varchar(50) | NO | | NULL | |
| relationship | varchar(50) | NO | | NULL | |
| date_of_birth | varchar(50) | NO | | NULL | |
| first_name | varchar(255) | NO | | NULL | |
| last_name | varchar(255) | NO | | NULL | |
| gender | varchar(10) | NO | | NULL | |
| student_type | varchar(50) | YES | | NULL | |
| email | varchar(255) | YES | | NULL | |
| phone | varchar(20) | YES | | NULL | |
| address | varchar(255) | YES | | NULL | |
| address2 | varchar(255) | YES | | NULL | |
| city | varchar(255) | YES | | NULL | |
| state | varchar(50) | YES | | NULL | |
| zip | varchar(50) | YES | | NULL | |
| mandate | varchar(10) | YES | | NULL | |
| ssn | varchar(11) | YES | | NULL | |
| suffix | varchar(20) | YES | | NULL | |
| department | varchar(50) | YES | | NULL | |
| password | varchar(255) | YES | | NULL | |
| benefit1 | varchar(255) | YES | | NULL | |
| benefit2 | varchar(255) | YES | | NULL | |
| benefit3 | varchar(255) | YES | | NULL | |
| benefit4 | varchar(255) | YES | | NULL | |
| benefit5 | varchar(255) | YES | | NULL | |
| benefit6 | varchar(255) | YES | | NULL | |
| plan1 | varchar(255) | YES | | NULL | |
| plan2 | varchar(255) | YES | | NULL | |
| plan3 | varchar(255) | YES | | NULL | |
| plan4 | varchar(255) | YES | | NULL | |
| plan5 | varchar(255) | YES | | NULL | |
| plan6 | varchar(255) | YES | | NULL | |
| account | int(11) | NO | | NULL | |
| enrollment_config | int(11) | NO | | NULL | |
| imported_at | datetime | YES | | NULL | |
| updated_at | datetime | YES | | NULL | |
| status | smallint(6) | YES | | NULL | |
| status_description | longblob | YES | | NULL | |
| student_import_id | int(11) | NO | | NULL | |
Result sets
mysql> select student_id from student_import_record where student_import_id = 185 limit 10;
+------------+
| student_id |
+------------+
| 1546 |
| 1660 |
| 2207 |
| 2349 |
| 3123 |
| 3208 |
| 3319 |
| 3811 |
| 3837 |
| 3842 |
+------------+
10 rows in set (0.02 sec)
mysql> select student_id from student_import_record limit 10;
+------------+
| student_id |
+------------+
| 0001546 |
| 0001660 |
| 0002207 |
| 0002349 |
| 0003123 |
| 0003208 |
| 0003319 |
| 0003811 |
| 0003837 |
| 0003842 |
+------------+
10 rows in set (0.00 sec)
Looks like you have already figured out what was going on. In the hope to close out this question, here's a link that explains type conversion in expression evaluation: https://dev.mysql.com/doc/refman/5.5/en/type-conversion.html
When an operator is used with operands of different types, type
conversion occurs to make the operands compatible. Some conversions
occur implicitly. For example, MySQL automatically converts numbers to
strings as necessary, and vice versa.
mysql> SELECT 1+'1';
-> 2
In your case, MySQL might be seeing arithmetic operation in the WHERE clause and performing implicit conversion to integers in that column. My recommendation is to structure the table, if possible, in a manner that numbers are in numeric column and non-numeric data is in its appropriate column. When there's mixed content, you could force the data to be character.
I have 3 tables person, account and subscription. Account belongs to Person as one to many and Account and Subscription are many to many.I need a sql which can select data from three tables.-
Person Tables
+----------------------------+--------------+------+-----+---------+----------------+
| Field | Type | Null | Key | Default | Extra |
+----------------------------+--------------+------+-----+---------+----------------+
| id | int(11) | NO | PRI | NULL | auto_increment |
| username | varchar(128) | NO | | NULL | |
| password | varchar(128) | NO | | NULL | |
| account_id | int(11) | NO | | NULL | |
+----------------------------+---------------+------+---------------+----------------+
Account table
+--------------+--------------+------+-----+---------+----------------+
| Field | Type | Null | Key | Default | Extra |
+--------------+--------------+------+-----+---------+----------------+
| id | int(11) | NO | PRI | NULL | auto_increment |
| yearly_renew | tinyint(1) | NO | | NULL | |
| date_joined | date | NO | | NULL | |
| last_renewed | datetime | YES | | NULL | |
| signup | tinyint(1) | NO | | NULL | |
| reason | varchar(100) | YES | | NULL | |
| yearly_total | int(11) | YES | | NULL | |
| total | int(11) | YES | | NULL | |
+--------------+--------------+------+-----+---------+----------------+
Account-Subscription table
+-----------------+---------+------+-----+---------+----------------+
| Field | Type | Null | Key | Default | Extra |
+-----------------+---------+------+-----+---------+----------------+
| id | int(11) | NO | PRI | NULL | auto_increment |
| account_id | int(11) | NO | MUL | NULL | |
| subscription_id | int(11) | NO | MUL | NULL | |
+-----------------+---------+------+-----+---------+----------------+
Subscription table
+-------------------+--------------+------+-----+---------+----------------+
| Field | Type | Null | Key | Default | Extra |
+-------------------+--------------+------+-----+---------+----------------+
| id | int(11) | NO | PRI | NULL | auto_increment |
| subscription_type | varchar(150) | YES | | NULL | |
| hold | tinyint(1) | NO | | NULL | |
| start_date | date | YES | | NULL | |
| end_date | date | YES | | NULL | |
| amount_paid | double | YES | | NULL | |
| date_paid | date | YES | | NULL | |
| transaction_id | int(11) | YES | | NULL | |
| free | tinyint(1) | NO | | NULL | |
+-------------------+--------------+------+-----+---------+----------------+
Expecting output in a single query -
OUTPUT
+-----------+------------+--------------+
| person.id | account.id | subscription.id |
+-----------+------------+--------------+
| 10 | 11 | 20 |
| 15 | 32 | 45 |
| 23 | 43 | null |
+--------+---------+-----------------+
try this. it may works properly...
SELECT p.Id AS person.id
,p.account_id AS account.id
,acsub.subscription_id as subscription.id
FROM Person AS p
LEFT JOIN Account-Subscription AS acsub ON p.account_id=acsub.account_id
SELECT p.Id AS person.id
,p.account_id AS account.id
,acsub.subscription_id as subscription.id
FROM Person AS p
INNER JOIN
Account-Subscription AS acsub ON p.account_id=acsub.account_id
I have following table called transactions and I want to add foreign key using column account_id. But when I execute the query (see below) 0 rows affected. I am not getting what is wrong with the query.
I have two tables called transactions and accounts. Accounts table has an id as primary key and an account has_many transactions.
transactions table
+---------------------+--------------+------+-----+---------+----------------+
| Field | Type | Null | Key | Default | Extra |
+---------------------+--------------+------+-----+---------+----------------+
| id | int(11) | NO | PRI | NULL | auto_increment |
| account_number | int(11) | YES | | NULL | |
| m_number | varchar(255) | YES | | NULL | |
| registration_number | varchar(255) | YES | | NULL | |
| page_number | varchar(255) | YES | | NULL | |
| entry_date | datetime | YES | | NULL | |
| narration | varchar(255) | YES | | NULL | |
| voucher_number | varchar(255) | YES | | NULL | |
| debit_credit | float | YES | | NULL | |
| profit | float | YES | | NULL | |
| account_code | int(11) | YES | | NULL | |
| balance | float | YES | | NULL | |
| branch | varchar(255) | YES | | NULL | |
| account_id | int(11) | YES | MUL | NULL | |
| created_at | datetime | YES | | NULL | |
| updated_at | datetime | YES | | NULL | |
+---------------------+--------------+------+-----+---------+----------------+
16 rows in set (0,01 sec)
mysql> ALTER TABLE transactions ADD FOREIGN KEY (account_id) REFERENCES accounts(id);
Query OK, 0 rows affected (0,03 sec)
Records: 0 Duplicates: 0 Warnings: 0
accounts table
+-----------------+--------------+------+-----+---------+----------------+
| Field | Type | Null | Key | Default | Extra |
+-----------------+--------------+------+-----+---------+----------------+
| id | int(11) | NO | PRI | NULL | auto_increment |
| account_number | int(11) | YES | | NULL | |
| account_code | int(11) | YES | | NULL | |
| branch | varchar(255) | YES | | NULL | |
| name | varchar(255) | YES | | NULL | |
| father_name | varchar(255) | YES | | NULL | |
| nic_number | varchar(255) | YES | | NULL | |
| mohalla | varchar(255) | YES | | NULL | |
| village | varchar(255) | YES | | NULL | |
| nominee | varchar(255) | YES | | NULL | |
| relationship | varchar(255) | YES | | NULL | |
| opening_balance | float | YES | | NULL | |
| opening_date | datetime | YES | | NULL | |
| created_at | datetime | YES | | NULL | |
| updated_at | datetime | YES | | NULL | |
+-----------------+--------------+------+-----+---------+----------------+
After running the query shouldn't the column say F_K or something like PRI ?
Any help would be great. Thanks!