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800Adams clerk 1100 950Ward salesman 1250 1100Martin salesman 1250 1250Miller clerk 1300 1250Turner salesman 1500 1300Allen salesman 1600 1500Clark manager 2450 1600Blake manager 2850 2450Jones manager 2975 2850Scott analyst 3000 2975Ford analyst 3000 3000King president 5000 300014 rows selected.The value corresponding to the first row is 500 after the default value is set.SCOTT @ www.bkjia.com> select ena

SQL statements, and executes SQL statements. Save the SQL statement in the file and save the SQL statement execution result in the file. Execute the statement in the saved file. Load the text file into the SQL * Plus editing window. 6 Other comparison operations Use the LIKE operation to select a similar value; The selection conditions can contain characters or numbers:% Represents zero or multiple characters (any character); _ represents one character; '%' and '-' can be used at the same tim

In the database, a null value is used to indicate that the actual value is unknown or meaningless. In a table, if a column in a row has no value, it is called NULL ). A null value can be returned for any data type column as long as the non-NULL or primary key integrity restriction is NOT used. In practical applications, ignoring the existence of null values may cause unnecessary troubles. For example, in the following employee table (EMP), the employee name (ENAME) is KING's Row, because KING i

NAND new manufacturing process in a few months will be mass production, we have reason to believe that large-capacity flash digital prices will fall by more than 20% in 2007. Because the storage part occupies MP3 or m P4 such digital products nearly 50% of the cost, so the micro-hard disk PK Flash will become the 2007 digital product price competition new impetus. Digital camera: The more The price war burns, the more the digital SLR camera changes the photographic experience In the 2006, two

How to connect to a network printer in win7 The company recently rented a Konica Minolta C250 network printer to connect, and the boss also had a laptop. When connecting to the printer, pay attention to some details to connect to the printer normally. Ensure that the printer is connected to the network normally. First, Test 1. Enter the IP address of the ping network printer at the command prompt] Connect to the network printer after the net

characters (any character); _ represents one character; '%' and '-' can be used at the same time; you can use the ESCAPE identifiers to select the '%' and '_' symbols. To avoid special symbols, use ESCAPE characters. For example, convert [%] to [\ %], [_] to [\ _], and then add [ESCAPE '\']. Use IS (NOT) NULL determines the NULL value. Example: Select * from emp where sal between 1000 and 2000; empno ename job mgr hiredate sal comm deptno ---------- --------- -------------- ------ 7499 allen sa

variable 100 is returned, and the final output result is 100. 3: Use the decode function for segmentation A higher salary than 5000 is a high salary. A Salary ranging from 3000 to 5000 is medium, and a lower salary than 3000 is a low salary. SQL Test SELECT ename,sal, DECODE(SIGN(sal - 5000), 1, 'high sal', 0, 'high sal', - 1, DECODE(SIGN(sal - 3000), 1, 'mid sal', 0, 'mid sal', - 1, DECODE(SIGN(sal - 1000),

returns 1, the result is 1, the first variable 100 is returned, and the final output result is 100. 3: Use the decode function for segmentation A higher salary than 5000 is a high salary. A Salary ranging from 3000 to 5000 is medium, and a lower salary than 3000 is a low salary. SQL Test SELECT Ename, sal, DECODE (SIGN (sal-5000 ), 1, 'High sal ', 0, 'High sal ', -1, DECODE (SIGN (sal-3000 ), 1, 'Mid sal ', 0, 'Mid sal ', -1, DECODE (SIGN (sal-1000 ), 1, 'Low sal ', 0, 'Low sal ', -1, 'Low sal

we need to do with SQL now? Yes, you're right. The LAG analysis function: Select Deptno, Sal A, lag (Sal, 1, Sal) b over (order by Deptno) from Scott.emp DeptnoA B 102450.00 2450--ps: The reason here is 2450 because of lag (Sal, 1, sal) I let it give him a value .105000.00 2450 101300.00 202975.00 1300 203000.00 2975 201100.00 20800.00 1100 203000.00 301250.00 301500.00 1250 301600.00 30950.00 302850.00 950 301250.00 2850 Yes, it's just that s

table represents the salary level, with the highest and lowest values for each grade. EMP table for employee's basic informationSql> select * from Salgrade;GRADE Losal Hisal---------- ---------- ----------1 700 12002 1201 14003 1401 20004 2001 30005 3001 9999Sql> Select Empno,ename,sal,grade2 from EMP e inner JOIN Salgrade s3 on e.sal between S.losal and S.hisal;EMPNO ename SAL GRADE---------- ---------- ---------- ----------7369 SMITH 800 17876 ADAMS 1100 17900 JAMES 950 17521 WARD

job mgr hiredate sal comm deptno ---------- --------- ---------- -------------- ---------- 7369 smith clerk 7902 CLERK 800 20 7499 allen salesman 7698 CLERK 1600 300 smith clerk 7369 17-DEC-80 7902 20 800 ALLEN SALESMAN 7698 20-FEB-81 1600 300 30 7521 ward salesman 7698 22-FEB-81 1250 500 30 7566 jones manager 7839 02-APR-81 2975 20 7654 martin salesman 7698 28-SEP-81 1250 1400 30 7698 blake manager 7839 0

, after the read-only attribute of the transaction is set, there will be no Phantom reads, repeated reads, or dirty reads in the skill service. Select (exclude for update) alter session alter system lock table set role eg: [sql] SQL> select * from emp; EMPNO ENAME JOB MGR HIREDATE SAL COMM DEPTNO ---------- ---------- --------- ---------- --------- ---------- ---------- ---------- 7369 SMITH CLERK 7902 17-DEC-80

dual;TO_DATE ('2017------------- 09-3-89TO_NUMBER (string): converts a string to a number for display. (Not required)SQL> select to_number ('1') from dual;TO_NUMBER ('1') ------------ 1SQL> select to_number ('1') + to_number ('2') from dual;TO_NUMBER ('1') + TO_NUMBER ('2') ----------------------------- 36. Common functions:There are two common functions: nvl () function, decode ().(1) nvl () function: Processing NullQuery the total annual salary of each employee:SQL> select ename, sal, comm, (

total salary 7934 MILLER 10 1300 8750 7782 CLARK 10 2450 8750 7839 KING 10 5000 8750 7369 SMITH 20 800 10875 7876 ADAMS 20 1100 10875 7566 JONES 20 2975 10875 7788 SCOTT 20 3000 10875 7902 FORD 20 3000 10875 7900 JAMES 30 950 9400 7654 MARTIN 30 1250 9400 7521 WARD 30 1250 9400 7844 TURNER 30 1500 9400 7499 ALLEN 30 1600 9400 7698 BLAKE 30 2850 9400 We can see from the result that the sum () function calcu

Oracle Database multi-Table query instance and Oracle database instanceFlute product: the number of columns is added, and the number of rows is multiplied. SQL> -- equivalent connection SQL> -- Query employee information: employee ID name monthly salary Department name SQL> set linesize 80SQL> desc dept name is blank? Type ----------------------------------------- -------- ---------------------------- deptno not null number (2) DNAME VARCHAR2 (14) LOC VARCHAR2 (13) SQL> select e. empno, e. enam

by arg2 exceeds the group range. Check Several SQL statements: Statement 1: Select row_number () over (order by sale/cnt desc) As sort, sale/CNTFrom (Select-60 as sale, 3 as CNT from dual UnionSelect 24 as sale, 6 as CNT from dual UnionSelect 50 as sale, 5 as CNT from dual UnionSelect-20 as sale, 2 as CNT from dual UnionSelect 40 as sale, 8 as CNT from dual ); Execution result: Sort sale/CNT--------------------1 102 53 44-105-20 Statement 2: Query employees' salaries, sorted by department Sele

, to_date (' 22-feb-1981 ', ' dd-mon-yyyy '), 1250, 500, 30); 1 row created. sql> INSERT INTO EMP values (7566, ' Jones ', ' manager ', 7839, to_date (' 2-apr-1981 ', ' dd-mon-yyyy '), 2975, NULL, 20); 1 row created. sql> INSERT INTO EMP values (7654, ' Martin ', ' salesman ', 7698,to_date (' 28-sep-1981 ', ' dd-mon-yyyy '), 1250, 1400, 30); 1 row created. sql> INSERT INTO EMP values (7698, ' Bl

, you guessed right. Use the LAG analysis function: Select Deptno, Sal A, lag (Sal, 1, Sal) b over (order by Deptno) from Scott.emp a B 10 2450.00 2450--ps: The reason this is 2450 is because lag (SAL, 1, sal) I let it give him a value of 10 50.00.00 2450 10 1300.00 5000 20 2975.00 1300 20 3000.00 2975 20 1100.00 3000 20 800.00 1100 20 3000.00 800 30 1250.00 3000-3 0 1500.00 1250 30 1600.00 1500 30 950.00 1600 30 2850.00 950 30 1250.00 2850 Yes it's t

) this.width=650; "src=" http://s3.51cto.com/wyfs02/M01/4C/52/wKioL1Q7aeLiUvbpAAC01XY4PEY362.jpg "title=" 1.jpg " alt= "Wkiol1q7aeliuvbpaac01xy4pey362.jpg"/>Two , AnatomySQL Server IOStatistical Information2.1primary knowledge of logical reading, physical reading and pre-readingLet's give an example first.650) this.width=650; "src=" http://s3.51cto.com/wyfs02/M01/4C/51/wKiom1Q7abrSlJRyAAF_waI4tYM244.jpg "title=" 2.jpg " alt= "Wkiom1q7abrsljryaaf_wai4tym244.jpg"/>querying the database for the fir

remuneration by department7934 MILLER 10 1300 87507782 CLARK 10 2450 87507839 KING 10 5000 87507369 SMITH 20 800 108757876 ADAMS 20 1100 108757566 JONES 20 2975 108757788 SCOTT 20 3000 108757902 FORD 20 3000 108757900 JAMES 30 950 94007654 MARTIN 30 1250 94007521 WARD 30 1250 94007844 TURNER 30 1500 94007499 ALLEN 30 1600 94007698 BLAKE 30 2850 9400You can see from the results that the sum () function sums