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What exactly does the .join () method do? - Stack Overflow
I'm pretty new to Python and am completely confused by .join() which I have read is the preferred method for concatenating strings. I tried: strid = repr(595) print array.array('c', random.sample(

What is a SQL JOIN, and what are the different types?
Note that a JOIN without any other JOIN keywords (like INNER, OUTER, LEFT, etc) is an INNER JOIN. In other words, JOIN is a Syntactic sugar for INNER JOIN (see: Difference between JOIN and INNER JOIN ).

LEFT JOIN vs. LEFT OUTER JOIN in SQL Server - Stack Overflow
LEFT OUTER JOIN - fetches data if present in the left table. RIGHT OUTER JOIN - fetches data if present in the right table. FULL OUTER JOIN - fetches data if present in either of the two tables. CROSS JOIN, as the name suggests, does n times m pairings that join everything

SQL JOIN: what is the difference between WHERE clause and ON clause?
The SQL JOIN clause allows you to associate rows that belong to different tables. For instance, a CROSS JOIN will create a Cartesian Product containing all possible combinations of rows between the two joining tables. While the CROSS JOIN is useful in certain scenarios, most of the time, you want to join tables based on a specific condition.

SQL Server Left Join With 'Or' Operator - Stack Overflow
Here is what I did in the end, which got the execution time down from 52 secs to 4 secs. SELECT * FROM ( SELECT tpl.*, a.MidParentAId as 'MidParentId', 1 as 'IsMidParentA' FROM TopLevelParent tpl INNER JOIN MidParentA a ON a.TopLevelParentId = tpl.TopLevelParentID UNION SELECT tpl.*, b.MidParentBId as 'MidParentId', 0 as 'IsMidParentA' FROM TopLevelParent tpl INNER JOIN MidParentB b ON b ...

Can I use CASE statement in a JOIN condition? - Stack Overflow
A CASE expression returns a value from the THEN portion of the clause. You could use it thusly: SELECT * FROM sys.indexes i JOIN sys.partitions p ON i.index_id = p.index_id JOIN sys.allocation_units a ON CASE WHEN a.type IN (1, 3) AND a.container_id = p.hobt_id THEN 1 WHEN a.type IN (2) AND a.container_id = p.partition_id THEN 1 ELSE 0 END = 1

sql - JOIN two SELECT statement results - Stack Overflow
Currently achieving this using the two select statement method with a LEFT JOIN (as opposed to the suggested INNER JOIN, which works but doesn't show persons with no late tasks because they don't exist in the second SELECT Also achieving this with the late column being SUM(CASE WHEN Age > Palt THEN 1 ELSE 0 END) Late –

What is the difference between JOIN and UNION? - Stack Overflow
The SQL JOIN clause is used to combine records from two or more tables in a database. A JOIN is a means for combining fields from two tables by using values common to each. The SQL UNION operator combines the result of two or more SELECT statements. Each SELECT statement within the UNION must have the same number of columns.

What is the difference between INNER JOIN and OUTER JOIN?
INNER JOIN OR EQUI JOIN : Returns the resultset that matches only the condition in both the tables. 2.OUTER JOIN : Returns the resultset of all the values from both the tables even if there is condition match or not. 3.LEFT JOIN : Returns the resultset of all the values from left table and only rows that match the condition in right table. 4.

Python 3 string.join() equivalent? - Stack Overflow
In most cases you want to use your pythonic '.'.join() approach, but there are legitimate, pythonic uses for str.join() (formerly string.join()) too. For example, you sometimes want the joining str to be configurable at runtime and want to pass the function (along with the joining str) on to other elements of a string-processing or NLP pipeline.

 

 

 

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