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Updating one table from another table

Even the idea create a temporary table holding only primary key and Column b, and then apply cursor to it is slow. Would u please help me how can i faster my procedure.u have given information 9i it same for oracle8i & dev6i.please help me Thank u very much for ur kind update information is really nice and working very insert----same prolem. That means -- just using math here -- that we have 600 seconds, 12,000 queries to run, 12000/60 = 20, so we are doing 20 per second -- or each query is taking 0.05 cpu seconds to run. do anything 12,000 times and you might have a problem tho! this might be one of the rare times that a temp table can be useful.

I am think of the way without using cursor, script as below. I don't understand what's the problem.i am going to give u full overview of my problem. The software is available in different portion of the country for data entry and report generation etc. What about: create global temporary table gtt ( id int primary key, cnt int ) on commit delete rows / you'll add that ONCE, it'll become part of your schema forever....

You may wish to update records in one table based on values in another table.

Since you can't list more than one table in the Oracle UPDATE statement, you can use the Oracle EXISTS clause.

You can use update queries in Access to update the values in a target table, and you can use another table to supply the values for the update.

The trick is to join the two tables using a common field and to properly specify the name of the field from the source table in the Update To cell.

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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You can also perform more complicated updates in Oracle.

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The Oracle UPDATE statement is used to update existing records in a table in an Oracle database.

Here are the steps to create an update query that updates values across tables: database.

Note that most of the purchase prices are null (see Figure 1-15).

256 comments

  1. You can update an entire row in one table with values from a row in another table.

  2. Use a Field in One Table to Update a Field in Another Table Problem You’ve imported a table that contains updated prices for some of the records in a.

  3. SQL update from one Table to another based on a ID match. Ask Question. When simply updating one table based on the rows of another table.

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