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Using DDL Statements to Create and Mange Tables
Create Table Statement
Must have
o Create table privilege
o A storage area
You specify
o Table name
o Column name, column data type and column sie!
"! C#$AT$ TA%L$ &SC'$MA!( TA%L$)AM$
*! +CLUM))AM$- DATATY.$-+CLUM) S/0$1, CLUM))AM$- DATATY.$
-+CLUM) S/0$112
$3ample4
C#$AT$ TA%L$ dept +deptno )UM%$#+*1, dname 5A#C'A#*+"61, loc
5A#C'A#*+"71,
create8date DAT$ D$9AULT SYSDAT$12
Describe the data structure
D$SC#/%$ dept2
Default ption4 specify a default value for a column during an
insert
Literal values, e3pressions, or S:L functions are legal
values!
The default data type must match the column data type!
$3ample4
C#$AT$ TA%L$ hire8dates +id )UM%$#+;1, hire8date DAT$ D$9AULT
SYSDAT$12
/ncluding Constraints
Constraints enforce rules at the table level!
Constraints prevent the deletion of a table if there are
dependencies!
The follo
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o U)/:U$
o .#/MA#Y =$Y
o 9#$/>) =$Y
o C'$C=
Create a constraint at either of the follo
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emp8dept8fB 9#$/>) =$Y +department8id1 #$9$#$)C$S
departments+ department8id1, C)ST#A/)T emp8email8uB
U)/:U$+email112
Column level
C#$AT$ table employees +@!!, department8id )UM%$#+61
C)ST#A/)T
emp8deptid8fB #$9$#$)C$S departments+department8id1,@12
9oreign Bey constraint4 Bey a table
All data and structure in the table are deleted!
Any pending transaction are committed
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All inde3es are dropped
All constraints are dropped
You cannot roll bacB the D#. table statement!
$3ample4
D#. table dept2
Manipulating DATA ;
/)S$#T statement4
/nsert a ne< ro< containing values for each column!
List values in the default order of the columns in the
table!
ptionally, list the columns in the insert clause!
$nclose character and date values in single Iuotation marBs!
/)S$#T /)T dep +department8id, department8name, manager8id,
location8id1
5A=U$S +J, K.ublic #elations, ", "J12
/mplicit method4 mit the column from the column list!
/)S$#T /)T dep +department8id, department8name1 5A=U$S +7,
K.ublic
#elations12
$3plicit Method4 Specify the )ULL Bey
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Grite your /)S$#T statement
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ALT$# table statement
Use the ALT$# TA%L$ statement to4
Add a ne< column
Modify an e3isting column
De?ne a default value of the ne< column
Drop a column
ALT$# table lol add+address varchar*+"112
ALT$# table lol modify +address varchar*+712
