Performing Curd Operations By Using Another Table In TeraData

Creating a Table From Another table

Create table<data base name><new table name>As<DB Nam><OLD Table name> with Data ---With data

Create table<data base name>.<New table name>As<DB Name>.<OLD table name> with no data ---- With no data with only structure

Updating table from Another table

Update test2 set PNM=”dum2” where pid= Update principle set principle. Phone= reception. Phone where principal picl=reception pid

Creating a table with Statistics From another table

Create table new as old with data and statists Create table new as old with no data and statists; Create table new as(select*from old)with data and statists

Note: To load only data from one table to another table go to ”Insert select”

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FAQ’S

Q1) Difference between the drop and delete

Ans:

Drop	Delete
1.Drops the objects(it removes the space no structure data available)	1) Delete only data
DDL Command	2.DML Command Delete are worked like truncate
3.It’s drops any objects	3.It’s only table and views
4.No rollback	4.Roll back is there
No transient journal overhead	5.Transcient journal overhead
6.Doesn't support where the condition	6.Support where condition

Q2) What is the difference between delete and delete all

Ans:- Delete all runs faster than normal delete, because below the reason

No Transient journal overhead

Works like a truncate command

No rollback

It works directly on the master and cylinder index.

Q3) Why insert select runs faster than normal insertion

Ans:-

Insert

With the same amp, the rows will be moved it runs faster.

Because same Amp operation

Revoke privilege

A B

X,y,z

m1,m2 Grant Insert on X to B

Grant select on X to B

Revoke Insert on X to B

Revoke select on X to B

Give

If runs for one database access rights to others, that means if the database having 50 users with different privileges à we can trans for all the 50 users and privileges and other databases. A(DB) B(DB)

100 Tables 100 Tables Give my DB to finance;