Hi all,
The SQL joins are used for combine rows from two or more table based on a common field between them.We are discuss this topic today. It fetch data from two or more tables and which is joined to appear as single set of data. Join Keyword is used in SQL queries for joining two or more tables. Minimum required condition for joining table, is (n-1) where n, is number of tables.
Different types of JOINs are available in SQL .They are:
- INNER JOIN
- LEFT JOIN
- RIGHT JOIN
- FULL JOIN
1) INNER Join or EQUI Join
The INNER JOIN selects all rows from both tablesresults based on the match between the columns in both tables. Returns all the rows when there is atleast one matches in both tables.
SYNTAX
SELECT column_name(s)
FROM table1
INNER JOIN table2
ON table1.column_name=table2.column_name;
or
SELECT column_name(s)
FROM table1
JOIN table2
ON table1.column_name=table2.column_name;
Example of INNER JOIN. The Employee1 table
Employee_ID | Employee_Name |
---|---|
1 | Jose |
2 | Thomas |
3 | Joseph |
The Employee2 table
Employee_ID | Salary |
---|---|
1 | 4000 |
2 | 8000 |
Inner JOIN query will be,
SELECT * from Employee1, Employee2 where Employee1.Employee_ID = Employee2.Employee_ID;
The result will be
Employee_ID | Employee_Name | Employee_ID | Salary |
---|---|---|---|
1 | Jose | 1 | 4000 |
2 | Thomas | 2 | 8000 |
2) LEFT Join
Return all rows from the left table, and the matched rows from the right table.
SYNTAX
SELECT column_name(s)
FROM table1
LEFT JOIN table2
ON table1.column_name=table2.column_name;
or
SELECT column_name(s)
FROM table1
LEFT OUTER JOIN table2
ON table1.column_name=table2.column_name;
Example of LEFT JOIN. The Employee1 table
Employee_ID | Employee_Name |
---|---|
1 | Jose |
2 | Thomas |
3 | Joseph |
The Employee2 table
Employee_ID | Salary |
---|---|
1 | 4000 |
2 | 8000 |
LEFT JOIN query will be,
SELECT Employee_ID, Employee_Name,Salary
FROM Employee1
LEFT JOIN Employee2
ON Employee1.Employee_ID = Employee2.Employee_ID;
The result will be
Employee_ID | Employee_Name | Salary |
---|---|---|
1 | Jose | 4000 |
2 | Thomas | 8000 |
3 | Joseph | NULL |
The LEFT JOIN keyword returns all rows from the left table (Employee1), with the matching rows in the right table (Employee2).
3) RIGHT Join
The right join return all rows from the right table, and the matched rows from the left table.
SYNTAX
SELECT column_name(s)
FROM table1
RIGHT JOIN table2
ON table1.column_name=table2.column_name;
or
SELECT column_name(s)
FROM table1
RIGHT OUTER JOIN table2
ON table1.column_name=table2.column_name;
Example of RIGHT JOIN. The Employee1 table
Employee_ID | Employee_Name |
---|---|
1 | Jose |
2 | Thomas |
3 | Joseph |
The Employee2 table
Employee_ID | Salary |
---|---|
1 | 4000 |
2 | 8000 |
RIGHT JOIN query will be,
SELECT Employee_ID, Employee_Name,Salary
FROM Employee1
RIGHT JOIN Employee2
ON Employee1.Employee_ID = Employee2.Employee_ID;
The result will be
Employee_ID | Employee_Name | Salary |
---|---|---|
1 | Jose | 4000 |
2 | Thomas | 8000 |
The RIGHT JOIN keyword returns all rows from the right table (Employee2), with the matching rows in the left table (Employee1).
4) FULL OUTER Join
Return all the rows from the left table and right table
SYNTAX
SELECT column_name(s)
FROM table1
FULL OUTER JOIN table2
ON table1.column_name=table2.column_name;
Example of FULL OUTER JOIN. The Employee1 table
Employee_ID | Employee_Name |
---|---|
1 | Jose |
2 | Thomas |
3 | Joseph |
The Employee2 table
Employee_ID | Salary |
---|---|
1 | 4000 |
2 | 8000 |
RIGHT JOIN query will be,
SELECT Employee_Name,Salary
FROM Employee1
FULL OUTER JOIN Employee2
ON Employee1.Employee_ID = Employee2.Employee_ID;
The result will be
Employee_Name | Salary |
---|---|
Jose | 4000 |
Thomas | 8000 |
Joseph |
If anyone has doubts on this topic then please do let me know by leaving comments or send me an email.
70918248
References:
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Ingest three (3) capsules accompanied by water forty five minutes prior
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Clenbutrol mimics Clenbuterol by causing thermogenesis within the
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Some anabolic steroids effects comprise synthetic forms of testosterone testosterone—the
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Earlier Than we talk about bodybuilding supplements closest to steroids, let’s break down the favored steroids
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Proteins and amino acids are vital for building and repairing muscles, making them must-haves for
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Nonetheless, Victor identified that the injectable version of L-Carnitine just isn’t legally available and can only be obtained by way of the underground market.
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The cycling beneficial is daunting and something I’m not thinking about.
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understanding often although my progress is mediocre.
I rock climb and wish considerably more energy than I at present have.
This happens as a end result of their stimulating effect on hepatic lipase within the
liver. Winstrol (stanozolol) is the second most widely used oral steroid (after Dianabol) and is predominantly used as a slicing agent.
Due to its delicate nature, a testosterone-only cycle
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Instances of Cushing syndrome because of topical corticosteroids most frequently occur due
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Topical steroid is typically mixed with another energetic ingredient,
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One of its unique medical uses was to increase muscle energy in sufferers
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Other OTC topical medications for eczema embody antihistamines,
such as diphenhydramine (Benadryl, Banophen).
Anavar’s capability to extend strength and energy could
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muscle cells (15), which will increase ATP (adenosine triphosphate) manufacturing.
A main downside we see with mibolerone is that it’s very
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Though the liver is generally a resilient organ, this compound
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You’ll be lifting heavier weights and should find your lifting motion improves
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If Anavar is the principle steroid you want to use, you’re
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This does imply you’re utilizing Anavar basically as a pre-workout steroid.
Weekend (proactive) therapy most likely ends in a big
decrease in likelihood of a relapse from 58% to 25% (risk ratio (RR) zero.forty three, 95% CI zero.32 to 0.fifty
seven; 7 trials, 1149 participants; moderate‐certainty evidence).
We searched databases to January 2021 (Cochrane Skin Specialised Register; CENTRAL; MEDLINE; Embase; GREAT) and five scientific
trials registers. We checked bibliographies from included trials
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Before you construct a New steroid alternative stack, you want to outline your main goal.
Every compound impacts the body differently — some promote
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Still, the standard Testosterone enanthate or
similar length Test ester often sees a 2-week clearing
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Dianabol ought to never be taken with one other hepatotoxic oral steroid (such as Anadrol, Superdrol, or Winstrol).
Seasoned steroid users who take Superdol for the primary time are often shocked by its ability to add lean muscle tissue and trigger monstrous
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