The best SQL queries and highly useful for SQL developers. You can learn and practice so quickly with less effort.

1. 1000 SQL Queries
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2. Join Example
EMP_NM EMP_JB SELECT nm.id ANSWER
+----------+ +--------+ ,nm.name ================
|ID|NAME | |ID|JOB | ,jb.job ID NAME JOB
|--|-------| |--|-----| FROM emp_nm nm -- ------- -----
|10|Sanders| |10|Sales| ,emp_jb jb 10 Sanders Sales
|20|Pernal | |20|Clerk| WHERE nm.id = jb.id 20 Pernal Clerk
|50|Hanes | +--------+ ORDER BY 1;
+----------+

3. Left Outer Join example
EMP_NM EMP_JB SELECT nm.id ANSWER
+----------+ +--------+ ,nm.name ================
|ID|NAME | |ID|JOB | ,jb.job ID NAME JOB
|--|-------| |--|-----| FROM emp_nm nm -- ------- -----
|10|Sanders| |10|Sales| LEFT OUTER JOIN 10 Sanders Sales
|20|Pernal | |20|Clerk| emp_jb jb 20 Pernal Clerk
|50|Hanes | +--------+ ON nm.id = jb.id 50 Hanes -
+----------+ ORDER BY nm.id;

4. Sub Query Example
EMP_NM EMP_JB SELECT * ANSWER
+----------+ +--------+ FROM emp_nm nm ========
|ID|NAME | |ID|JOB | WHERE NOT EXISTS ID NAME
|--|-------| |--|-----| (SELECT * == =====
|10|Sanders| |10|Sales| FROM emp_jb jb 50 Hanes
|20|Pernal | |20|Clerk| WHERE nm.id = jb.id)
|50|Hanes | +--------+ ORDER BY id;
+----------+

5. Thank you
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