Top "Left-join" questions

Django ForeignKey with null=True, inner join, and left outer join

Let's say I have two Django models Person and Company as follows: - class Company(models.Model): name = models.CharField() …

django left-join inner-join

Adding filter on the right side table on Left outer joins

On outer joins(lets take a left outer join in this case) how does adding a filter on the right …

sql sql-server join left-join right-join

SQL Left Join (Multiple Join Condition)

I have two derived tables named Check Ins and Check Outs Check Ins CheckDate CheckIn ---------- --------- 08/02/2011 10:10:03 08/02/2011 15:57:16 07/19/2011 13:58:52 07/19/2011 16:50:55 07/26/2011 15:11:24 06/21/2011 12:36:47 08/16/2011 14:49:36 08/09/2011 13:52:10 08/09/2011 16:54:51 08/23/2011 15:48:58 09/06/2011 15:23:00 09/13/2011 10:09:27 09/13/2011 10:40:14 09/13/2011 11:43:14 09/13/2011 11:59:32 09/13/2011 17:05:24 09/20/2011 11:03:42 09/20/2011 12:08:50 09/20/2011 15:21:06 09/20/2011 15:34:29 09/27/2011 11:34:06 10/04/2011 11:37:59 10/04/2011 15:24:04 10/04/2011 16:57:44 10/11/2011 18:19:33 Check Outs CheckDate …

sql-server-2005 validation datetime left-join derived-table

Why is mySQL query, left join 'considerably' faster than my inner join

I've researched this, but I still cannot explain why: SELECT cl.`cl_boolean`, l.`l_name` FROM `card_legality` cl …

mysql database left-join inner-join

sql left join for two tables using a CONCAT string as the argument

I need to get a title from table 2, table 2 has title and id column. Table 1 has some data and three …

mysql left-join column-alias

Calculate time difference in Teradata

I have a scenario to calculate difference of timestamp in minute. There is one common field in 2 tables i.e …

datetime timestamp left-join teradata teradata-sql-assistant

How does Left Join / IS NULL eliminate records which are there in one table and not in the other?

I am having a tough time to understand why does LEFT JOIN / IS NULL eliminate records which are there in …

mysql sql left-join isnull

LINQ to EF left join with multiple condition

I am trying to replicate the following SQL using LINQ to EF but with no luck. select * from Role left …

linq-to-entities left-join multiple-conditions

Mysql error: violation: 1052 Column 'created_at' in where clause is ambiguous'

I am getting the issue: Integrity constraint violation: 1052 Column 'created_at' in where clause is ambiguous but the table sales_…

mysql left-join mysql-error-1052

joinLeft Zend Framework, the same field names in different tables

I've got a problem. I'm trying to left join two tables with Zend Framework using $select object. Unfortunatly my tables …

zend-framework select left-join zend-db