concatenate in oracle sql query

Tags: SQL paging query statement Oracle SELECTFirst of all, this is a table structure of my query for the following statementT_user Insert the following dataInsert the following data into the T_departT_role Insert the following dataWell, after we've built the table, we start the database

san', '1', '2', 8 ); Insert into student (id, name, sex, grade, age) values (2, 'lily', '0', '1', 11 ); Insert into student (id, name, sex, grade, age) values (3, 'wang wu', '1', '2', 9 ); Insert into student (id, name, sex, grade, age) values (4, 'Liu 2', '0', '4', 8 ); Insert into student (id, name, sex, grade, age) values (5, 'Han liu', '0', '3', 6 ); -- Insert into sexcode Insert into sexcode (dm, mc) values ('1', 'male '); Insert into sexcode (dm, mc) values ('0', 'female '); -- Insert i

simple SELECT statement Syntax format: SELECT *| { For example, select * from emp, or select Empno, ename, Sal from EMP; Display effect: Sql*plus default display: Date and character data left-aligned, numeric data right-aligned, column headings default to uppercase Isql*plus default display: Column headings are displayed in uppercase by default, column headings are centered by default Use an arithmetic expression Overview: In a SELECT statement

151510 1450 Select Se.last_name,se.salary,se.dept_id,temp.avgsalFrom S_emp SE, (Select Dept_id,avg (Salary) AvgsalFrom S_empGROUP BY dept_id) Tempwhere se.dept_id = temp.dept_idand Se.salary > temp.avgsal; 1. Query for employee information2. For example, to find out the staff information in Sector 41st, which is higher than the average salary of department 41st (this department) Select AVG (Salary), dept_idFrom S_empGroup BY DEPT_ID; Select last_nam

FROM cte a INNER JOIN TBL_TEST b ON a.id = b.PID)SELECT * FROM cte;The above two methods have all found positive results. The Start With of the first method is equivalent to the part above union all of the second method. connect by is equivalent to the part below union all. The CTE method is portable. It is also supported by SQL SERVER and DB2. You can refer to the following articles for more examples of the CTE method:

USED_PERSENTFROM (SELECT TABLESPACE_NAME, SUM (BYTES)/1024/1024 TOTAL_MBFROM DBA_TEMP_FILESGroup by TABLESPACE_NAME) TMP_TBS,(SELECT TMP_USED.TABLESPACE,TMP_USED.SEGTYPE,SUM (TMP_USED.BLOCKS * PARA. DB_BLOCK_SIZE)/1024/1024 USED_MBFrom v $ SORT_USAGE TMP_USED,(Select value DB_BLOCK_SIZEFrom v $ PARAMETERWhere name = 'db _ BLOCK_SIZE ') PARAGroup by TMP_USED.TABLESPACE, TMP_USED.SEGTYPE) USED_TOTWHERE TMP_TBS.TABLESPACE_NAME = USED_TOT.TABLESPACE (+)Group by TMP_TBS.TABLESPACE_NAME, USED_TOT.SEG

Oracle experience 5 -- add, delete, modify, query, and @ oracle transaction processing @ Case Analysis1. add, delete, modify, and query DML (Data Manipulation Language-Data operation Language) in Oracle can be executed under the following conditions: insert Data into the tab

of the other Oracle server) (port = port number)) ) (Connect_data = (service_name = Other Oracle Server service name) ) )' Where the name of the data chain is the service name added to the local Oracle Database Console (Oracle Enterprise Manager Console) tree nodeThe table tablename statement to

-defined integrity : For example: In student form the age of secondary school students cannot be greater than 60 (user-defined conditions) 3. Connection Query The connection in Oracle is the same as MySQL, there are also self connected query, outer connection (including left outer connection, right outer connection, full outer connection), and internal connection

Oracle data query using C # for SQL or ASP. When the query condition exists in Chinese , because the data server and client/natively have different character sets , the data table has data, but the data is not queried. However, data queries can be made using the same string as the