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has been strengthened again, we can not set the NOT NULL here, greatly reducing the possible error operationSee the following experimental processCREATE table T, where more than 1 million rows of data.Sql> Select COUNT (*) from T; COUNT (*)---------- 1454256Add a column directly to the table (not set NOT NULL)Sql> ALTER T
Tags: com log useful use user logs comment a colorAll tables Select from // tables owned by the current user Select from // All users ' tables Select from // including system tables Notes for Tables Select * from // comments for the current user owning the table Select * from // comments for all user tables Select * from // comment dba_tab_comments for all user tables , all_tab_comments One more ower
In Oracle 10 Gb, there is a single-Table query SQL statement, which does not have a where clause, but simply calculates the maximum and minimum values of a column at the same time.According to our understanding, it should undergo a full index scan, but it does. The data size of a single table is a little large, and the
--Lists the number of employees and departmental numbers for which wages are higher than the average wage in each department, and the select * from EMP E1 by department number, (select round avg (SAL), 2) Sal,deptno from EMP Group by Deptno) E2 where e1.sal>e2.sal and e1.deptno=e2.deptno the order by e1.deptno ASC; Create Test table --The row-and-column test CREATE
Use the mygeneration Automatic Generation Code tool to obtain the Database Name and data table name of all Oracle databases. The procedure is as follows:1. Set the database link string provider = oraoledb. oracle.1; Password = mypassword; persist Security info = true; user id = myid; Data Source = mydatasource in default settings of mygeration2. Copy the followin
only obtain the desired result by entering the data dictionary Code such as 01 02 03 during filtering. However, you do not know the dictionary code. Then, in the filtering area, read the database dictionary items in the drop-down box to filter the items. The operation is as follows: Go to the pagedefine. xml page. Add a drop-down List: Select the second select one value list that update a base data source Then select model driven. List find the LO
Oracle lists all the table names. The column name takes one day. there may be better methods. test environment: oracle xe 11g 1 shows all table names: select table_name from user_tables; 2 shows all column names: select OWNER, TAB
Label:First, Sqlplus, the direct use of Desc[ribe] tablename can be. Second, when external application calls view the table structure in Oracle, you can only use the following statement instead: 1. See field names and data types Select * from cols WHERE table_name=upper (' table_name '); --(user_tab_columns abbreviation cols) 2. View all Columns Select * from user_tab_columns WHERE tab
can submit one or multiple rows to avoid table lock **/ -- If mod (city_cur % rowcount, 10000) = 0 then -- Dbms_output.put_line ('----'); -- Commit; -- End if; End loop; End; 5) a special case of associated update and further exploration of performanceIn oracle's update statement syntax, in addition to the update
Oracle Multi-Table Association UPDATE statement 2013-12-23 17:15:49Category: OracleFor the sake of convenience, the following simple models are established and some test data are constructed:In a business admissibility subsystem BSS,SQL Code --Customer Data sheet Create Table Customers ( CUSTOMER_ID Number (8
When analyzing the performance of some statements, we will analyze some information. Such as tables, columns, indexes, and histograms. This article mainly describes the collection and analysis of statistical information of tables and columns.I. Table statistics First, create a test table, update some data, and add some constraints: Create
Tmp_cust_city b where b.customer_id=a.customer_id ) Note In this statement,= (select B.city_name,b.customer_type from tmp_cust_city bwhere b.customer_id=a.customer_id)And(select 1 from tmp_cust_city bwhere b.customer_id=a.customer_id)is two independent subqueries, to view the execution plan, the B/Index scan 2;If you discard the where condition, the default is to make a table full tableUpdated, but becauseSQL Code Select B.city_name fro
b.customer_id=a.customer_id) where exists (select 1 From Tmp_cust_city b where b.customer_id=a.customer_id ) Note In this statement,= (select B.city_name,b.customer_type from tmp_cust_city bwhere b.customer_id=a.customer_id)And(select 1 from tmp_cust_city bwhere b.customer_id=a.customer_id)is two independent subqueries, to view the execution plan, the B/Index scan 2;If you discard the where condition, the default is to make a table full tabl
customer's information, so an error (if the specified column--city_name can be null is another matter):SQL Code01407 00000 " cannot update (%s) to NULL " // *cause: // *action:An alternative approach can take:SQL CodeUpdate customers A-- using the alias set city_name=nvl (selectfromwhere b.customer_id=a.customer_id), A.city_name)OrSQL CodeSet CITY_NAME=NVL ((selectfromwhere b.customer_id=a.customer_id),' U
value list that update a base data source Then select model Driven list to find the lov of the field The code generated in the XML is as follows, the proficiency of the word after the direct copy on the line The name of the Lov that users are using iterbinding is the iteration of which table is used Once the page definition file is complete, you can draw a filtered drop-down box on the page with the F:f
Label:--Create sequence Create sequence Innerid minvalue 1 maxvalue 99999999999999 start with 1 increment by 1 cache order;2.--innerid.currval refers to the current sequence--innerid.nextval refers to the next sequenceCREATE TABLE admin (ID varchar2 (), name VARCHAR2 (10));Insert into admin values (innerid.nextval, ' a '); Insert into admin values (innerid.nextval, ' B '); Insert into admin values (innerid.nextval, ' C '); Insert into admin values (in
a table, the only association after the update. Update (select T.name,t2.name name2 from T_sms_phoneno T,t_sms_phoneno2 T2 where T.phoneno=t2.phoneno) set name=name2; 5. Create a new table and update it. CREATE TABLE Temp_sms_pho
Link to the comprehensive exercise for creating, updating, and querying Oracle notes (11): Oracle notes (1) Introduction to Oracle and installation of explain (2) SQLPlus command http://www.bkjia.com/database/201209/154051.html#oraclenotes (3) scott user's table structure partition (4) simple query, restricted query, d
, because this statement is used to change the records of table t_1, if no record exists in Table T_2, the record in Table T_1 is left blank;Solution: if you do not want to get such a result, you need to add a where condition.Update t_1 a set (a. year, a. month) = (select B. year, B. month from T_2 B where B. id = a. id)Where a. id = (select c. id from year4 c wh
Label: update data for another table with data from one table in Oracle Category: Sql/plsql2012-05-04 15:49 4153 People read Comments (1) favorite reports OraclemergesubqueryinsertnullThere are two tables that update Val in the table
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