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

968

---

Point out the difference between user tables and data dictionary?

939

---

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

913

---

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

1316

---

What do you mean by merge in oracle?

941

---

Describe an oracle table?

999

---

What are the differences between primary key and unique key?

953

---

What is the difference between substr and instr?

984

---

Describe varray?

1009

---

How can you merge two tables in oracle?

943

---

How to store pictures on to the database?

928

---

Explain temporal data types in oracle

1044

---

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

994

---

Is rowid unique in oracle?

948

---

Is primary key indexed by default in oracle?

937

---