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

1013

---

Point out the difference between user tables and data dictionary?

987

---

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

951

---

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

1371

---

What do you mean by merge in oracle?

996

---

Describe an oracle table?

1055

---

What are the differences between primary key and unique key?

1013

---

What is the difference between substr and instr?

1042

---

Describe varray?

1064

---

How can you merge two tables in oracle?

1003

---

How to store pictures on to the database?

979

---

Explain temporal data types in oracle

1098

---

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

1038

---

Is rowid unique in oracle?

1003

---

Is primary key indexed by default in oracle?

992

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