SQL Tutorial

astechedu · Feb 21, 2024 · 8d8544e · 8d8544e
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diff --git a/sqlphp/developer-notes/databases/subqueries.txt b/sqlphp/developer-notes/databases/subqueries.txt
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+<<<  SQL Subqueries  <<<<<
+
+
+
+-------------------------------------------------------------------
+-------------------------------------------------------------------
+Keys: 
+-------------------------------------------------------------------
+-------------------------------------------------------------------
+
+//Subqueries: 
+https://youtu.be/vz62aKmNpFQ?t=454
+
+-------------------------------------------------------------------
+-------------------------------------------------------------------
+
+
+-----> Subqueries <-----
+
+max(), min() and avg():
+
+select *from student where fee=(select max(fee) from student);
+select *from student where fee=(select min(fee) from student);
+select *from student where fee>=(select avg(fee) from student);
+
+
+select * from student where reg_no=(select reg_no from marks total=(select max(total) from marks));
+
+
+-------------------------------------------------------------------
+-------------------------------------------------------------------
+-------------------------------------------------------------------