update column from another table in oracle

TABLE table_nameadd CONSTRAINT constraint_name UNIQUE (column_name);Delete ConstraintALTER TABLE table_namedrop CONSTRAINT constraint_name;disabling constraintsBy default, constraints are disabled when create is started and can be created again.ALTER TABLE table_nameadd CONSTRAINT constraint_name UNIQUE (column_name) DISABLE;Start a constraint, disable a constra

The following article describes the actual application of the update statement in Oracle multi-Table Association, we have established the following simple model and constructed part of the test data: in a business acceptance subsystem BSS, Customer Data Table createtablecustomers ( customer_idnumber(8)notnu

The following article describes how to update multiple fields with conditions in Oracle multi-Table Association, if you are a beginner in Oracle multi-table join update with multiple fields with actual conditions, you can use the

Tags: sel master table from Oracle Multi-Table association score ROM Multiple updateNote the point:1, the Update main table must be added filter conditions.2, the query to update the result set, but also to be updated as the main

How to associate two Mysql table update operations in OracleWhen reading MySQL 5.1 reference manual, we found that MySQL provides a two-table join update operation. The original article is as follows: UPDATE items, month SET items. price = month. priceWHERE items. id = month

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; BANNER ---------------------------------------------------------------------- Oracle Database 11g Enterprise Edi

') WHERET.schedule_datebetweenTo_date ('2018-01-01','YYYY-MM-DD') andsysdate; 　　 　　Parse:close_tz field is VARCHAR2 type, 1 and 0 are number types--error SQL2: Using the Decode () function, it will not be empty in the specified caseUPDATEConsult_schedule TSETT.close_tz=DECODE (Close_tz,'1','No','0','is a') WHERET.schedule_datebetweenTo_date ('2018-01-01','YYYY-MM-DD') andsysdate;After the update, execute the above query statement again　　Cause: Dependi

Tags: head rom post modify Simple Table association ext use City1) The simplest formSQL Code--confirmed that all customer_id less than 1000 of the Customers table are ' Beijing '--1000 within the company to the country before the old customers of the city:) update customersset city_name= ' Beijing ' where customer_id2) Two tables (multiple tables) associated

Cascading updates using the nominal: The code is as follows Copy Code CREATE TABLE A001 (ID INT PRIMARY key,name VARCHAR (20))CREATE TABLE A002 (id INT REFERENCES A001 (ID) on DELETE CASCADE on UPDATE cascade,age TINYINT) Example 1 The code is as follows Copy Code DeclareCURSOR D_cursor_cus_info

Drop table Course;create table course (ID integer,teacherno integer,teacherdesc varchar2 (+), TeacherName varchar2 (50), Coursename varchar2); INSERT into course values (1,100, ' Mr.zhang ', ' Zhangsan ', ' 中文版 '); INSERT into course values ( 2,101, ' Mr.wang ', ' Wangwu ', ' history '), insert into course values (2,101, ' Mr.wang ', ' Wangwu ', ' Chinese '); update