Updating two tables in oracle Edmonton voyeur chat

So, with the syntax shown earlier in mind, let us put things together, and look at some practical examples.BTW – If you are interested in where I get the data for these examples – they are from the sample schemas (OE, HR, etc.) that comes with most Oracle database installations.drop table t; drop table s; create table t (id number, name varchar2(32)); create table s (id number, name varchar2(32)); insert into t values (1,'1'); insert into t values (2,'2'); insert into t values (3,'3'); insert into t values (4,'4'); insert into t values (5,'5'); insert into s values (3,'three'); insert into s values (5,'five'); select * from t; update t set name = (select name from s where = s.id); select * from t; Our first table (t) simply has the numbers 1-5 in the 'id' and 'name' column but we want to update some of the names based on the contents of the second table (s) but this table only has values for two of the rows. 1 rows inserted 1 rows inserted 1 rows inserted 1 rows inserted 1 rows inserted 1 rows inserted 1 rows inserted ID NAME ---------------------- -------------------------------- 1 1 2 2 3 3 4 4 5 5 5 rows selected 5 rows updated ID NAME ---------------------- -------------------------------- 1 2 3 three 4 5 five 5 rows selected The problem here is that the update isn't a true 'join' as every row is going to be updated and if the 'join' fails then a null is written.This is OK so long as we can preserve the 'default' numeric values. I have to update a transaction table where mapping is existing with old account no and new account number. etc I have a mapping table where "ALL" old account number and new account numbers are present. First off: The Oracle UPDATE statement is a part of the Oracle DDL (Data Definition Language) that can be used to alter the content or structure of a table in our database.

By 'join update' I mean the situation where we have two tables and want to update some of the rows in the first table based on values that exist in the second table.

But, the syntax example above might not show the whole truth, since we can have a situation like this: In the expanded version of our UPDATE syntax above, the value that we want to update column1 with, actually comes from a different table.

BUT, in this post I really wanted to show you how to update multiple columns in a table at once.


This may seem like a simple question: Update Column a1 in Table A with all data in Column b1 in Table B. I have a table named A containing say 100000 records. HSCODELIST 5 WHERE not exists 6 (SELECT NULL FROM VIStemp. Brao what I suggest then is not to do it in a single sql statement -- just proving that "there are exceptions to every rule". Type ----------------------------------------- -------- ---------------------------- BIN VARCHAR2(10) ACT_SL VARCHAR2(3) ACT_CODE VARCHAR2(11) ACT_VAL NUMBER(14,2) ENTRY_DATE DATE SQL DESC VIS. Type ----------------------------------------- -------- ---------------------------- BIN VARCHAR2(10) ACT_SL VARCHAR2(3) ACT_CODE VARCHAR2(11) ACT_VAL NUMBER(14,2) ENTRY_DATE DATE SQL UPDATE (SELECT DBHSCODELIST. the database needs to know that each row in dbhscodelist will map to AT MOST one row in hscodelist - this mandates a primary or unqiue key constraint on the join columns this is discussed in the original answer above.

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If it is not possible can you show me how to write "GOOD" sql ? i.e, one column of a table should get updated from another column of another table.

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