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Added "Full Join Section" (#20330)

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* index.md

Added 'Full Join'.

* Fix grammer "gonna" to "going to"
This commit is contained in:
awais305
2018-11-02 21:19:09 +05:00
committed by Niraj Nandish
parent 394ea7aa93
commit 4732932851
1 changed files with 26 additions and 0 deletions
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26
guide/english/sql/sql-joins/index.md
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@ -89,6 +89,32 @@ LEFT JOIN `student-contact-info` AS b ON a.studentID = b.studentID;
9 rows in set (0.00 sec)
```
### Full (Outer) Join
In this type, we're going to try to return everything from both tables. If there is no match, we'll get NULL(empty) at that place.
```sql
SELECT a.studentID, a.FullName, a.sat_score
b.`studentEmailAddr`, b.`student-phone-cell`
FROM student AS a
FULL JOIN `student-contact-info` AS b ON a.studentID = b.studentID;
```
```text
+-----------+------------------------+-----------+----------------------------------+--------------------+
| studentID | FullName | sat_score | studentEmailAddr | student-phone-cell |
+-----------+------------------------+-----------+----------------------------------+--------------------+
| 1 | Monique Davis | 400 | Monique.Davis@freeCodeCamp.org | 555-555-5551 |
| 2 | Teri Gutierrez | 800 | Teri.Gutierrez@freeCodeCamp.org | 555-555-5552 |
| 3 | Spencer Pautier | 1000 | Spencer.Pautier@freeCodeCamp.org | 555-555-5553 |
| 4 | Louis Ramsey | 1200 | Louis.Ramsey@freeCodeCamp.org | 555-555-5554 |
| 5 | Alvin Greene | 1200 | Alvin.Green@freeCodeCamp.org | 555-555-5555 |
| 6 | Sophie Freeman | 1200 | Sophie.Freeman@freeCodeCamp.org | 555-555-5556 |
| 7 | Edgar Frank "Ted" Codd | 2400 | Maximo.Smith@freeCodeCamp.org | 555-555-5557 |
| 8 | Donald D. Chamberlin | 2400 | Michael.Roach@freeCodeCamp.ort | 555-555-5558 |
| 9 | Raymond F. Boyce | 2400 | NULL | NULL |
+-----------+------------------------+-----------+----------------------------------+--------------------+
```
### Complete table listings for reference
Student table listings