update column from another table in oracle

Gets the primary key column name of the table SQLSELECT * FROM User_cons_columnswhere constraint_name = (select Constraint_name from user_constraintsWHERE table_name = ' bst_favorite ' and constraint_type = ' P ');Remember : table names are capitalizedPerform the test, the table all the primary keys are detected, the p

For simpler tables, the amount of data is not a very much table, you can use a simple SQL statement to back up CREATE TABLE t_fa_cat_20121207 as SELECT * from T_fa_cat Create a new table and save the data INSERT INTO T_fa_cat select * from t_fa_cat_20121207 To import the original backed-up data into a table to r

Tags: OTT CLU ADL MDA MDX nic UVC p2c papYou is using update mode and you tried to update a table without a where is uses a key column to disable Safe modeYou are using update mode, and you are trying to update a

B. col_n = A. col_m)Where a. col_m = (select B. col_n from table_2 B where B. col_n = A. col_m) Note: 1. The subquery value can only be a unique value, not a multi-value.2. In most cases, the where exists clause at the end is important. Otherwise, an error is returned. The where exists clause can be replaced by another method. The last clause limits the updated records of table A. If this clause is absent, for a record in

Query the information of an oracle table (table, field, constraint, index) by column name + Table name query constraint name SELECT * FROM USER_CONSTRAINTS WHERE table_name = upper ('org _ info ') SELECT * FROM USER_CONSTRAINTS WHERE CONSTRAINT_NAME = upper ('sys _ C0065894

When multiple timestamp are present in a table and one is set to Current_timestamp, you often encounter#1293-incorrect table definition; There can is only onetimestamp column with Current_timestamp in DEFAULT or on UpdateclauseThe reason is that when you set the timestamp to on Updatecurrent_timestamp, the other timestamp fields need to explicitly set the default

column contains the entire primary key of the table being updated. In addition, the FROM clause of the delete in Oracle does not have the ability to join multiple tables, but only by means of subqueries:Delete from Table A where exists (SELECT * from table B where

Tags: rollback between database Ali statistics AAA user ack whereFirst, update the operation of the dataDML operation syntax, in addition to the query also has data Library update operations, data Update operation mainly refers to: Add, modify, delete data, but considering the EMP table to continue to use, so the follo

Tags: 9.png oba Unable to install MySQL Open database name solution SQLWhen using EF dbfirst to update the model, a hint of the error, which is the VS EF reference to MySQL-generated errors, such as: Solution: 1.win+r Open the Run window, enter services.msc carriage return, and then find the MYSQL57 service (you may not call the MySQL57 service here, because this name can be changed when you install MySQL), restart the MySQL service. 2. Then open M

How do I update SQL statements for column data between oracle tables ?, Oraclesql Table A (id, name, age, home_adders, phone_number) and Table B (id, name, adders, number, the two tables have two fields with the same id and name, and can uniquely identify A row.

| +--------------------+ |information_schema| |myfirstdb| |mysql | |performance_schema | |phpmyadmin| |sys | +--------------------+ 6rowsinset (0.00sec) mysql>usemyfirstdb readingtableinformationforcompletionoftableandcolumn Names Youcanturnoffthisfeaturetogetaquickerstartup with-a databasechangedTo view all tables under the current database:View all the contents of the specified table:Mysql> show tables; +---------------------+ | Tables_in_myfirstdb | +---------------------+ |firsttable | | per

Tags: backup action snippet play RAC step drop empty cannot Scenario The columns in the original table are defined as VARCHAR2 types, and it is well known that the maximum support length for the VARCHAR2 type is 4000. Assume that because of business needs. To convert this column to the CLOB type, it is not feasible to convert directly through the ALTER statement in Orac