What is a sub query? Describe its types?

1037

---

What is the difference between count (*), count (expression), count (distinct expression)?

1017

---

Point out the difference between user tables and data dictionary?

997

---

What do you mean by merge in oracle and how can you merge two tables?

972

---

Difference between the “verify” and “feedback” command?

1379

---

What do you mean by merge in oracle?

1008

---

Describe an oracle table?

1065

---

What are the differences between primary key and unique key?

1026

---

What is the difference between substr and instr?

1053

---

Describe varray?

1072

---

How can you merge two tables in oracle?

1019

---

How to store pictures on to the database?

994

---

Explain temporal data types in oracle

1106

---

List out the difference between commit, rollback, and savepoint?

1059

---

What is transaction server isolation?

1057

---