update column from another table in oracle

--oracle Table Error Update flashback operation test Environment--select * from V$database;--select * from V$version;The first step of operation1. Enable row migration with the following commandALTER TABLE test_a enable row movement;2. The following command flashes back to a certain point in timeFlashback

, Customer_type) = (select B.city_name,b.customer_type from tmp_cust_city b where b.customer_id=a.customer_id) where exists ( select 1 from tmp_cust_city b where B.customer_id=a.customer_id) --方法1. UPDATE表2 SET 表2.C=(SELECTBFROM表1WHERE表1.A=表2.A) WHERE EXISTS(SELECT1FROM表1WHERE表1.A=表2.A)--方法2 MERGEINTO表2 USING表1 ON (表2.A=表1.A)--条件是A相同 WHENMATCHEDTHENUPDATESET表2.C=表1.B--匹配的时候，更新TwoOracle Random Read n data method in

Oracle Multiple Table Association UPDATE statement 1 The simplest form of SQL code --confirmed that all customer_id less than 1000 of the Customers table are ' Beijing ' Within the--1000 are the company to the country before the old customers in the city: Update customers

Early this morning because to do some operations in the database, is about the two tables associated with the update, but the statement how to write is not correct, always error, so scared (afraid not to complete the operation in time) to check, NND, the original SQL written in SQL Server under the unique form, This syntax does not work under Oracle, and is quickly changed back to complete the task in time.

First look at our data: SQL> select count (1) from Dave where cust_tel like '2013 '; Count (1) ---------- 2723 In our Dave table, cust_tel had 0551 records starting with 2723. Now we have changed these records to 0556. Let's test it using the following method: SQL> select * from V $ version; There are many writing methods, and the key is to pay attention to efficiency issues, especially when the data volume to be updated is large. In addition, we

CREATE TABLE T1 (ID Number (10),Name VARCHAR2 (10));CREATE TABLE T2 (ID Number (10),Name VARCHAR2 (10));INSERT into T1 values (1, ' 06 ');INSERT into T1 values (2, ' 02 ');INSERT into T2 values (3, ' 03 ');INSERT into T2 values (1, ' 01 ');SELECT * from T1;select * from T2;Update T1Set t1.name = (select T2.name from T2 where t2.id=t1.id)where exists (select * fro

C # Gets the SQL statement for the column name and data type of a table in the Oracle database: Select Column_name,data_type, Data_length,data_precision,data_scale from User_tab_ columns [where table_name= table name] Description of this SQL statement: column_name: A table

can use ROWID Update, the UPDATE statement is as follows: Update Test a set (col1,col2) = (select Trim (b.col1), Trim (b.col2) from Test b where A.rowid=b.rowid) where exists (select 1 from Test b where A.rowid=b.rowid) Multiple Table Association Delete 1 use in or not to delete data Delete from Tes

MERGE is a composite statement used to implement INSERT, UPDATE, and DELETE operations at a time. Syntax: merge into table/view using (TABLE/VIEW/SUBQUERY) ON (condition) [when metched then update set column = expr/DEFAULT [WHERE condition] www.2cto.com [delete where conditi

About Oracle Update multiple table problemsThere are several ways to achieve this:One is:Update table1Set (field1,field2 ...) =(Select field1,field2 .....)From table2where Table1.field1=table2.field1)where Table1.field1 in (select Field1 from table2) Two kinds are:Create a primary key primary key or union key for the table1,table2 associated fieldUpdate (Select t

Tags: Oracle index optimizationLab environment: Oracle Database 11g Enterprise Edition Release 11.2.0.4.0-64bit Production1. Create TABLE to insert dataSql> CREATE TABLE txtx (ID int,name char (2), TX char (3), Id1 int,primary key (ID,NAME,TX)); The table is created. sql> IN

Yesterday, we found that the data analysis results in the program were incorrect. After the analysis was performed again, the original data was still there and the fields with values were accumulated. The heart said, No, It was analyzed only after record generation. Forgot to DELETE? Check the code and find a delete statement. Therefore, the query analyzer executes the statement and reports an error. I have tried it several times. Now, Delete From does not recognize the

Yesterday, we found that the data analysis results in the program were incorrect. After the analysis was performed again, the original data was still there and the fields with values were accumulated. The heart said, No, It was analyzed only after record generation. Forgot to DELETE? Check the code and find a delete statement. Therefore, the query analyzer executes the statement and reports an error. I have tried it several times. Now, Delete From does not recognize the

1--first look at which locks are2 Select /*+ Rule*/S.username,3Decode (L.type,'TM','TABLE LOCK','TX','ROW LOCK',NULL) Lock_level,4 O.owner,5 O.object_name,6 O.object_type,7 s.sid,s.serial#,8 s.terminal,9 S.machine,Ten S.program, One S.osuser A fromV$session s,v$Lockl,dba_objects o - whereL.sid =S.sid -and L.ID1 = o.object_id (+) theand S.username isNotNULL - ---if there's a lock waiting, look who's locked the t