Perplexity AI Investor Presentation Deck
November 29: Stack Overflow
denis used /stackoverflow
perplexity.al NOT Today at 10:41 AM
@denis: how to write a join query in SQL
There are a few ways to write a join query in SQL. One way is to use the INNER JOIN function [1]:
SELECT
I. R.YCOL
FROM LeftTable AS L
INNER JOIN RightTable AS R
ON L.IDCol-R. IDCol;
Another way is to use the LEFT JOIN function [2]:
SELECT L.XCOI, R.YCol
FROM LeftTable AS L
LEFT JOIN Right Table AS R
ON L.IDCOL-R. IDCol:
You can also use the RIGHT JOIN function [3]:
SELECT L.XCol. R.yCal
FROM LeftTable AS L
RIGHT JOIN RightTable AS R
ON L.IDCO1-R.IDCol;
Finally, you can use the FULL JOIN function [4]:
SELECT L.XCol, R.YCol
FROM LeftTable AS L
FULL JOIN RightTable AS R
ON LIDCO1-R. IDCol;
[1]: https://stackoverflow.com/questions/37193759/what-is-a-result-table-in-sql
[2]: https://stackoverflow.com/questions/26763919/sql-join-are-selects-between-more-than-2-tables-still-joins
[3]: https://stackoverflow.com/questions/25161747/how-to-implement-sql-joins-without-using-join
[4]: https://stackoverflow.com/questions/36930767/how-to-add-leading-zero-when-number-is-less-than-10View entire presentation