2. CREATING TABLE The SQL syntax forCREATE TABLEis CREATE TABLE
"table_name" ("column 1" "data_type_for_column_1", "column 2"
"data_type_for_column_2", ... ) 3. This ALTER TABLE sql command is
to make changes in the table. The synatx is: ALTER TABLE[
owner_name ] table_name [ADD column_name datatype attributes]
[MODIFY{column_name datatype |column_constraint}]Example Query:
ALTER TABLE STUDENT ADD(PERCENTAGE NUMBER(5,2)); 4. TheSQL INSERT
INTOclause facilitates the process of inserting data into a SQL
table. Here is how you can insert a new row into the Weather table,
usingSQL INSERT INTO: Insert into tablename (fieldname, fieldname,
fieldname )values (value, value, value ); INSERT 5. SELECT TheSQL
SELECTclause selects data from one or more database tables and/or
views. In its basic form theSQL SELECT syntax looks like this:
SELECT ColumnName1, ColumnName2, FROM Table1 6. TheSQL WHEREclause
works in conjunction with other SQL clauses like SELECT, INSERT and
UPDATE to specify a search condition for these statements. We are
going to give an example of the SQL WHERE clause used along with
theSQL SELECT clause: SELECT AverageTemperatureFROM Weather WHERE
City = 'New York' WHERE 7. TheSQL DISTINCTclause works in
conjunction with the SQL SELECT clause and selects only distinct
(unique) data from a database table(s). Here is an example of SQL
DISTINCT clause SELECT DISTINCT Column1 FROM Table1 TheSQL
DISTINCTclause works in conjunction with the SQL SELECT clause and
selects only distinct (unique) data from a database table(s). Here
is an example of SQL DISTINCT clause SELECT DISTINCT Column1 FROM
Table1 DISTINCT 8. UPDATE TheSQL UPDATE clause serves to update
data in database table. The SQL UPDATE clause basic syntax looks
like this: UPDATE Table1 SET Column1 = Value1, Column2 = Value2, 9.
DELETE The SQL DELETE clause is used to delete data from a database
table. The simplestSQL DELETE syntax looks like this: DELETE FROM
Table1 10. TRUNCATE The SQL TRUNCATE TABLE clause deletes all rows
from a database table. Here is theSQL TRUNCATE TABLE syntax:
TRUNCATE TABLE Weather 11. ORDER BY The SQL ORDERBY clause defines
in what order to return a data set retrieved with a SQL SELECT
statement. Here is an example of using SQL ORDER BY to order the
rows : Select*/fieldname ... fromtablename order byfieldname ; 12.
SQL AVERAGE To get the average temperature for the Weather table
use the AVG SQL aggregate function: SELECT AVG(AverageTemperature)
FROM Weather 13. SQL MINIMUM To get the minimum value from a
numeric table column, use theSQL MINaggregate function: SELECT
MIN(AverageTemperature) FROM Weather 14. SQL GROUP BY The SQL GROUP
BY CITY clause is used along with the SQL aggregate functions and
specifies the groups where selected rows are placed. WHEN one or
more aggregate functions are presented in the SQL SELECT column
list, the SQL GROUP BY clause calculates a summary value for each
group EX:Our task is to calculate the average temperature for each
of the cities in the Weather table. Here is how to accomplish that
using the SQL GROUP BY clause: SELECT City, AVG(AverageTemperature)
FROM Weather GROUP BY City 15. SQL JOIN The SQL JOIN clause selects
data from two or more tables tied together by matching table
columns SELECT Weather.City, Weather.AverageTemperature,
Weather.Date, State.State FROM Weather JOIN State ON Weather.City =
State.City 16. AND/OR The Syntax forAND/OR SELECT "column_name"
FROM "table_name" WHERE "simple condition" {[AND|OR] "simple
condition"}+ 17. IN The Syntax forINstatement in SQL is SELECT
"column_name" FROM "table_name" WHERE "column_name" IN ('value1',
'value2', ...) 18. BETWEEN The Syntax forBETWEENstatement in SQL is
SELECT "column_name" FROM "table_name" WHERE "column_name" BETWEEN
'value1' AND 'value2' 19. DROP The Syntax forDROPstatement in SQL
is DROP TABLE "table_name"
