?? script_64_沒使用shangpin表.txt

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---------- sysdate_insert.txt ----------
/*
 * 范例名稱：系統(tǒng)變量函數(shù)
 * 文件名稱：sysdate_insert.txt
 */

INSERT INTO plsql101_purchase VALUES 
     ('Small Widget', 'SH', sysdate,10 );
--以SYSDATE:系統(tǒng)當前時間作為PURCHASE_DATE

INSERT INTO plsql101_purchase VALUES 
     ('Medium Wodget', 'SH', sysdate-14, 15);
--14天以前購買的
INSERT INTO plsql101_purchase VALUES 
     ('Round Snaphoo', 'SH', sysdate-7, 25);
INSERT INTO plsql101_purchase VALUES 
     ('Chrome Phoobar', 'SH', sysdate+7, 10);
--7天以后將購買的：什么涵義呢？
     
 
     
---------- sysdate_insert_select.txt ----------
/*
 * 范例名稱：系統(tǒng)變量函數(shù)
 * 文件名稱：sysdate_insert_select.txt
 */

SELECT * FROM plsql101_purchase 
WHERE  purchase_date BETWEEN (SYSDATE-30) AND SYSDATE;
--什么涵義呢？
DELETE FROM plsql101_purchase
WHERE  SALESPERSON = 'SH';



---------- round.txt ----------
/*
 * 范例名稱：系統(tǒng)變量函數(shù)
 * 文件名稱：round.txt
 */

SELECT product_name, product_price
FROM   plsql101_product;

SELECT product_name, ROUND(product_price, 0)
FROM   plsql101_product;

SELECT ROUND(1234.5678, 4) FROM DUAL;
SELECT ROUND(1234.5678, 3) FROM DUAL;
SELECT ROUND(1234.5678, 2) FROM DUAL;
SELECT ROUND(1234.5678, 1) FROM DUAL;
SELECT ROUND(1234.5678, 0) FROM DUAL;
SELECT ROUND(1234.5678, -1) FROM DUAL;
SELECT ROUND(1234.5678, -2) FROM DUAL;
SELECT ROUND(1234.5678, -3) FROM DUAL;

--round實用
--商品信息表練習.txt中
--求出各庫存商品的利潤率 = 利潤 / 投資
select itemname , 
(sale_price * (1-tax)-purchase_price ) / (purchase_price)
from sm_itemlist;
--有何不足？利潤率不需要太精確。如何處理？

select itemname , 
round((sale_price * (1-tax)-purchase_price ) / (purchase_price),2)
from sm_itemlist;


---------- TRUNC.txt ----------
/*
 * 范例名稱：系統(tǒng)變量函數(shù)
 * 文件名稱：TRUNC.txt
 */

SELECT TRUNC(1234.5678, 4) FROM DUAL;
SELECT TRUNC(1234.5678, 3) FROM DUAL;
SELECT TRUNC(1234.5678, 2) FROM DUAL;
SELECT TRUNC(1234.5678, 1) FROM DUAL;
SELECT TRUNC(1234.5678, 0) FROM DUAL;
SELECT TRUNC(1234.5678, -1) FROM DUAL;
SELECT TRUNC(1234.5678, -2) FROM DUAL;
SELECT TRUNC(1234.5678, -3) FROM DUAL;



---------- UPPER_LOWER_INITCAP.txt ----------
/*
 * 范例名稱：系統(tǒng)變量函數(shù)
 * 文件名稱：UPPER_LOWER_INITCAP.txt
 */
 
SELECT UPPER(product_name) FROM plsql101_product;
SELECT LOWER(product_name) FROM plsql101_product;
SELECT INITCAP(product_name) FROM plsql101_product;

SELECT INITCAP('this TEXT hAd UNpredictABLE caSE') FROM DUAL;

--數(shù)據(jù)準備

drop table shangpin;
--建立商品表
create table shangpin
(name varchar(20),
 price number(8,2),
 shuliang number(3));
--插入數(shù)據(jù)
insert into shangpin values ('TCL電視',100,3);
insert into shangpin values ('豆腐',1,30);
insert into shangpin values ('tcl電腦',1000,3);
insert into shangpin values ('Tcl電話',50,3);
insert into shangpin values ('Abb開關',1,30);


--顯示所有TCL的商品。
--一種笨方法
select * from shangpin where 
name like '%TCL%' 
OR
name like '%Tcl%' 
OR
name like '%tcl%'; --如果嚴格，還要加多種排列組合。

select * from shangpin where upper(name) like '%TCL%';

--顯示所有TCL的商品,并以大寫TCL...顯示
select UPPER(name), price,shuliang
from shangpin where upper(name) like '%TCL%';
--顯示所有TCL的商品,并以大寫Tcl...顯示
select initcap(name), price,shuliang
from shangpin where upper(name) like '%TCL%';

--更新所有TCL產(chǎn)品為標準名稱TCL...
update shangpin set name=UPPER(name)
where UPPER(name) like '%TCL%';


 
 
---------- LENGTH.txt ----------
/*
 * 范例名稱：系統(tǒng)變量函數(shù)
 * 文件名稱：LENGTH.txt
 */

 
SELECT   product_name, LENGTH(product_name) NAME_LENGTH
FROM     plsql101_product
WHERE    LENGTH(product_name) >15
ORDER BY product_name;


SELECT   name, LENGTH(name)
FROM     shangpin
ORDER BY LENGTH(name);
--注意：如果為中文數(shù)據(jù)，一個中文一個英文全被認為是1


---------- SUB_STRING.txt ----------
/*
 * 范例名稱：系統(tǒng)變量函數(shù)
 * 文件名稱：SUB_STRING.txt
 */

drop table PLSQL101_OLD_ITEM;

CREATE TABLE plsql101_old_item (
     item_id   CHAR(20),
     item_desc CHAR(25)
     )
;

INSERT INTO plsql101_old_item VALUES
     ('LA-101', 'Can, Small');
INSERT INTO plsql101_old_item VALUES
     ('LA-102', 'Can, Large');
INSERT INTO plsql101_old_item VALUES
     ('LA-103', 'Bottle, Small');
INSERT INTO plsql101_old_item VALUES
     ('LA-104', 'Bottle, Large');
INSERT INTO plsql101_old_item VALUES
     ('NY-101', 'Box, Small');
INSERT INTO plsql101_old_item VALUES
     ('NY-102', 'Box, Large');
INSERT INTO plsql101_old_item VALUES
     ('NY-103', 'Shipping Carton, Small');
INSERT INTO plsql101_old_item VALUES
     ('NY-104', 'Shipping Carton, Large');

--將一數(shù)據(jù)分開顯示
SELECT SUBSTR(item_id, 1, 2) , --取第1，2個
       SUBSTR(item_id, 4, 3) , --取4，5，6個
       item_desc
FROM   plsql101_old_item
;
--
 
INSERT INTO plsql101_old_item VALUES
     ('NY-10444', 'Shipping Carton, Large');


-----開始
--從第4個起，全取出
SELECT SUBSTR(item_id, 1, 2) MFGR_LOCATION,
       SUBSTR(item_id, 4, LENGTH(item_id)) ITEM_NUMBER,
       item_desc
FROM   plsql101_old_item
;

---------- INSTR.txt ----------
---
---開始
/*
 * 范例名稱：系統(tǒng)變量函數(shù)
 * 文件名稱：INSTR.txt
 */
--解釋：補充3.ppt
SELECT item_desc FROM   plsql101_old_item;
--為了將物品的單位，和對它的描述分開
--需要將old_item表的item_desc，從，進行分解，此時必須用INSTR定位逗號

--先定位，
SELECT item_desc, 
       INSTR(item_desc,',',1) 
FROM   plsql101_old_item;

--逗號以前的取出，取到逗號前一個
SELECT item_desc,
       SUBSTR(item_desc, 1, INSTR(item_desc,',',1)-1)
FROM   plsql101_old_item;

--逗號以后的取出，逗號和空格=+2，99為全取出
SELECT item_desc,
       SUBSTR(item_desc,INSTR(item_desc,',',1) +2,99)
FROM   plsql101_old_item;

--更好的方法
SELECT item_desc,
       SUBSTR(item_desc,INSTR(item_desc,',',1) +2,LENGTH(item_desc)-INSTR(item_desc,',',1)-2)
FROM   plsql101_old_item;

SELECT item_desc,
       SUBSTR(item_desc,INSTR(item_desc,',',1) +2,LENGTH(item_desc)-INSTR(item_desc,',',1)-2)
FROM   plsql101_old_item;
--err!此處當是-1.因為INSTR(item_desc,',',1)已經(jīng)是,的位置。后面只有一個空格。
--這里沒現(xiàn)出來是因為是char,length全為最長。如為varchar2會少一個。


--分別取出兩段紀錄
SELECT item_desc,
       SUBSTR(item_desc, 1,INSTR(item_desc,',',1) -1) ,
       SUBSTR(item_desc,INSTR(item_desc,',',1) +2,99) 
FROM   plsql101_old_item;

--練習要求
drop table shangpin;
--建立商品表
create table shangpin
(name varchar(20),
 price number(8,2),
 shuliang number(3));

--插入數(shù)據(jù),商品名為 廠家,產(chǎn)品
insert into shangpin values ('TCL,電視',100,3);
insert into shangpin values ('三元,豆腐',1,30);
insert into shangpin values ('tcl,電腦',1000,3);
insert into shangpin values ('Tcl,電話',50,3);
insert into shangpin values ('Abb,開關',1,30);
insert into shangpin values ('Abb,電腦',100,30);

--將廠家與產(chǎn)品分別顯示
--將所有含字母的廠家名大寫



---------- TRIM.txt ----------
/*
 * 范例名稱：系統(tǒng)變量函數(shù)
 * 文件名稱：TRIM.txt
 */
select * from plsql101_old_item;
--想將item的名稱和描述連接起來，問題：
--顯示結果含大量空格，分析原因：是 CHAR,VARCHAR2
SELECT 'Item  ' || 
       item_id ||
       ' is described as a ' ||
       item_desc        
FROM   plsql101_old_item;


SELECT 'Item  ' || 
       RTRIM(item_id) ||
       ' is described as a ' ||
       RTRIM(item_desc)
FROM   plsql101_old_item;



---------- sysdate_err.txt ----------
/*
 * 范例名稱：日期函數(shù)
 * 文件名稱：sysdate_err.txt
 */

INSERT INTO plsql101_product VALUES 
     ('Square Zinculator', 45, 1, SYSDATE);

SELECT * FROM plsql101_product;


-- 當天日期輸入為測試日期
SELECT * FROM plsql101_product
WHERE  last_stock_date = '當天日期';
如：
SELECT * FROM plsql101_product
WHERE  last_stock_date = '29-11月-01';


SELECT * FROM plsql101_product
WHERE  last_stock_date = '28-11月-00';


---------- sysdate_trunc.txt ----------
/*
 * 范例名稱：日期函數(shù)
 * 文件名稱：sysdate_trunc.txt
 */
 
-- 當前日期為標準格式
SELECT * FROM plsql101_product
WHERE  TRUNC(last_stock_date) = '當前日期';

--TRUNC(last_stock_date,0)對不對?

DELETE FROM plsql101_product 
WHERE  product_name = 'Square Zinculator';

--方法2：在插入時就避免
INSERT INTO plsql101_product VALUES 
     ('Square Zinculator', 45, 1, trunc(sysdate));
 
-- 當前日期為標準格式
SELECT * FROM plsql101_product
WHERE  last_stock_date = '當前日期';
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