sql oracle case statement in where clause

The following describes how to write SQL statements for mysqlOraclemssql to retrieve the first few pieces of data. For more information, see. The following describes how to write SQL statements for mysql/Oracle/mssql to retrieve the first few pieces of data. If you need them, refer to them. The following describes how to write

Oracle journey (ii) SQL statement query settings such as t_chmo_order_opera p, business table t_chmo_teruser u, user table t_chmo_province, Province table t_chmo_opera_price r price list ----- value-added business details select p. oo_source_num as phone number, r. opera_price as amount, cp_province_name as region, p. oo_create_time as date, u. ct_category as ope

Tags: Unlock index family repeat completely delete int nbsp Read letNot NULL non-null field +not null Unique only Primary key primary key (ensure data cannot be duplicated) FOREIGN key foreign key Check must Drop purge completely removed Cascade Delete: Delete A department, the staff in the department then delete the --->on delete cascade Empty: Transfer employees from the department to Null, delete Department --->on delete set null Cannot move: Delete the employee first, then delete the

, AVG (degree) as average from score where Cno like ' 3% ' GROUP by Cno have Count (Cno) >5; 13, the query score is greater than 70, less than 90 of the SNO column. SELECT * from score where degree between and 90; 14. Sname, CNO and degree columns for all students are queried. Select S.sname,c.cno,c.degree from student S, score C where S.sno=c.sno; 15. Check the SNO, CNAME and degree columns of all students. Select C.sno,q.cname,c.degree from student S, score c,course Q where S.sno=c.sno and q.c

1. Single Grouping function650) this.width=650; "src=" http://s3.51cto.com/wyfs02/M00/72/F2/wKiom1XwLKPAAOrjAAB9Ym73cYI651.jpg "style=" float: none; "title=" 2015-09-09_204103.png "alt=" Wkiom1xwlkpaaorjaab9ym73cyi651.jpg "/>650) this.width=650; "src=" http://s3.51cto.com/wyfs02/M01/72/EF/wKioL1XwLs-yBan5AADzSRxWszs527.jpg "style=" float: none; "title=" 2015-09-09_204640.png "alt=" Wkiol1xwls-yban5aadzsrxwszs527.jpg "/>2.This article is from the "ten-li Rice flower" blog, please be sure to keep

Select UPPER (f.tablespace_name) "Table space name",D.TOT_GROOTTE_MB "Table space size (M)",D.tot_grootte_mb-f.total_bytes "used Space (M)",To_char (ROUND ((d.tot_grootte_mb-f.total_bytes)/d.tot_grootte_mb * 100,2), ' 990.99 ') | | '% ' "use ratio",F.total_bytes "free Space (M)",F.max_bytes "Max Block (M)"From (SELECT Tablespace_name,ROUND (SUM (BYTES)/(1024x768 * 1024x768), 2) Total_bytes,ROUND (MAX (BYTES)/(1024x768), 2) max_bytesFrom SYS. Dba_free_spaceGROUP by Tablespace_name) F,(SELECT DD.)

Optimization tips for SQL statements with millions of records in ORACLE 1. To optimize queries, try to avoid full table scanning. First, you should consider creating an index on the columns involved in where and order. Www.2cto.com 2. try to avoid null value determination on the field in the where clause. Otherwise, the engine will discard the index and perform f

Tags: where and ora nbsp ROM statement time record innerwith T1 as (select Ylplid,max (SBSJ) sbsj from YLPLCG where Ylplid in (select Ylplid from CYQYCPYLPLGX where cpid= ' 659DE0BC 42544b74b660e37e665f437c ') group by ylplid) SELECT t.ylplmc,case if t.ylpllx =1 then ' raw material ' when T.YLPLLX = 2 Then ' ingredients ' End Ylpllx, t.gysid,t.gysmc,t.jyhgbgdtpid from YLPLCG t INNER joins T1 on t.ylplid = t

The WMS warehouse management system implements the "sending and receiving daily report" data query function. SQL statement: Oracle [SQL] www.2cto.com SELECT AA. PRODUCT_CNAME, AA. PRODUCT_ID, AA. PRODUCT_CODE, AA. MODEL, AA. MASTER_UNIT, AA. OTHER_UNIT, AA. PACKAGE_RATIO, AA. CUSTOMER, SUM (week) AS QTY_OUT_TODAY, QTY_

I. Pre-compiled SQL statement Processing PreparedStatement is an interface in java. SQL. It is a subinterface of Statement. When you use the Statement object to execute an SQL Statement

Oracle copies an SQL statement (test OK) for any table row, oraclesql I tested it for a long time. There are many methods on the Internet, but they are all incorrect. The correct method is as follows: declare cursor rowAll is select * from tb_news where 1=1; row1 tb_news%rowtype; i int; begin i := 0; for row1 in rowAll loop

In actual application, multiple insert statements may be executed at a time. I know two ways to do this: 1. write the statement block in tools such as PLSQL in begi In actual application, multiple insert statements may be executed at a time. I know two ways to do this: 1. write the statement block in tools such as PLSQL in begi In actual application, multiple insert statements may be executed at a time

Oracle processes the attendance time, splits the SQL statement of the attendance period, and oraclesql I have been using mysql databases for cloud projects recently, but I haven't been in touch with oracle for some time. Yesterday, a friend asked me to help me deal with an attendance record with

Writing a simple SQL statement in Oracle Code highlighting produced by Actipro CodeHighlighter (freeware)http://www.CodeHighlighter.com/-->-- 1 remove spaces on both sides of the field content in SQL statements. Rtrim (ltrim ('Demo ')) -- Truncates a character before a string Ltrim ('20140901', '1 ') -- Show: 2121 ---

Go to sqlplus SQL> set timing on SQL> SQL> select count (*) from comm_human_role; Count (*) ---------- 866 Elapsed: 00:00:00. 05 The preceding digital outputs are: Hours: Minutes: seconds. milliseconds. It takes 0.05 seconds to execute, which is equivalent to 50 milliseconds. If the time is as follows: 00: 03: 235.78 The total time is 235.78 seconds, l

Explain plan is a good tool for analyzing SQL statements. It can even analyze statements without executing SQL statements. through analysis, we can know how Oracle connects to the table, how to scan the table (index scan or full table scan), and the index name used. You need to interpret the analysis results in the order from inside to outside. the results of the

Label:Oracle queries recently executed SQL statements select Sql_text,last_load_time from V$sql order by last_load_time Desc;SELECT Sql_text, last_load_time from V$sql WHERE last_load_time are not NULL and sql_text like ' select% ' ORDER by Las T_load_time DESC; SELECT Sql_text, last_load_time from V$sql WHERE last_lo

, Add_months (hiredate,12*10) as service life date from EMP;--Show employee details, sorted by nameSELECT * from emp order by ename;-Show the employee's name, according to their service life, the oldest employees in the frontSelect ename from emp order BY hiredate Desc;--Displays the names, jobs, and salaries of all employees, sorted in descending order of work, sorted in ascending order by salarySelect Ename,job,sal from emp order by job desc,sal ASC;--Displays the names of all employees and th

, Add_months (hiredate,12*10) as service life date from EMP;--Show employee details, sorted by nameSELECT * from emp order by ename;-Show the employee's name, according to their service life, the oldest employees in the frontSelect ename from emp order BY hiredate Desc;--Displays the names, jobs, and salaries of all employees, sorted in descending order of work, sorted in ascending order by salarySelect Ename,job,sal from emp order by job desc,sal ASC;--Displays the names of all employees and th