How to change all insertions in a file of updates?

So I worked on this vast project that many of you have helped me on.

It turns out that I need to update these data instead of inserting it.  The data set that is in the database of development is not a match to the production data set.

So if I have a file with a ton of platelets, which is the best way to convert them to update statements?

piece of example 1 script...

1 quick insertion

Insert into NRN_SV_BY_SITETYPE

(SV_CN, ROUND, REGION_CODE, AFOREST_CODE, TYPESITE,

SAMP_STRATUM, SAMPLEYEAR, SITE_VISITS, SITE_VISITS_VARIANCE, NF_VISITS,

NF_VISITS_VARIANCE, SITE_VISITS_COEF_VAR, NF_VISITS_COEF_VAR, LAST_UPDATE, VPDUNIT_ID)

Values

("E2AB1040D01B210AE0440003BA0F14C2", 3, "R01", "A01003", "LOSERS",)

"FR3", "F2012", 20914, 1199862, 17937

1448239, 0.0524 0.0671, TO_DATE (JULY 29, 2013 13:05:02 ',' DD/MM/YYYY HH24:MI:SS'), '0103');

2 quick insertion

Insert into NRN_SV_BY_SITETYPE

(SV_CN, ROUND, REGION_CODE, AFOREST_CODE, TYPESITE,

SAMP_STRATUM, SAMPLEYEAR, SITE_VISITS, SITE_VISITS_VARIANCE, NF_VISITS,

NF_VISITS_VARIANCE, SITE_VISITS_COEF_VAR, NF_VISITS_COEF_VAR, LAST_UPDATE, VPDUNIT_ID)

Values

("E2AB1040D01C210AE0440003BA0F14C2", 3, "R01", "A01003", "LOSERS",)

'HIGH', 'F2012', 9197, 624510, 8823,

597473, 0,0859, 0.0876, TO_DATE (JULY 29, 2013 13:05:02 ',' DD/MM/YYYY HH24:MI:SS'), '0103');

3 Quick insertion

Insert into NRN_SV_BY_SITETYPE

(SV_CN, ROUND, REGION_CODE, AFOREST_CODE, TYPESITE,

SAMP_STRATUM, SAMPLEYEAR, SITE_VISITS, SITE_VISITS_VARIANCE, NF_VISITS,

NF_VISITS_VARIANCE, SITE_VISITS_COEF_VAR, NF_VISITS_COEF_VAR, LAST_UPDATE, VPDUNIT_ID)

Values

("E2AB1040D01D210AE0440003BA0F14C2", 3, "R01", "A01003", "LOSERS",)

'LOW', 'F2012', 15342, 49624415, 13341

39133245, 0.4592 0.4689, TO_DATE (JULY 29, 2013 13:05:02 ',' DD/MM/YYYY HH24:MI:SS'), '0103');

Need to all be converted to the updates instead of inserts.

I'm ready to any ideas on that.

Thank you!

Hello

Like Dave, I like to keep things simple.  In this case, however, I find an INSTEAD OF trigger just about as simple as an UPDATE statement (perhaps because the trigger is almost nothing other than an UPDATE statement).  The relaxation will be much more efficient, because it does an UPDATE (not an INSERT followed by an UPDATE), and it will take less space, because only 1 copy of the data is stored.

Here is an example.  In this trigger, I'm assuming that 2 columns (sv_cn and rnd) to identify each row uniquely.  In your real table, it seems that 5 columns identify each line, but by adding the other 3 should be easy.  Similarly, this example only updates 2 columns (site_visits and site_visits_variance), but you want really updated 8 columns.  Again, add the other 6 should be easy once you see how it's done.

VIEW to CREATE or REPLACE nrn_sv_by_sitetype
AS
SELECT *.
OF main_schema.nrn_sv_by_sitetype;

CREATE OR REPLACE TRIGGER nrn_sv_by_sitetype_ii
Instead of UPDATE on nrn_sv_by_sitetype
FOR EACH LINE
BEGIN
UPDATE main_schema.nrn_sv_by_sitetype
SET site_visits =: NEW.site_visits
, site_visits_variance =: NEW.site_visits_variance
WHERE sv_cn =: NEW.sv_cn
AND rnd =: NEW.rnd - ROUND is not a column name good
;
END nrn_sv_by_sitetype_ii;
/
DISPLAY ERRORS

This view and trigger are created in the temporary diagram (which I called FUBAR earlier), which is where the INSERTION instructions must be performed.

The code above assumes that the main schema name is main_schema.

If you have 2 other tables in main_schema which must be updated in the same way, then create 2 more times and 2 triggers more resembles those from above.

Instead of INSERT means just that: when you issue an INSERT statement on the view, then the INSERT statement is never actually executed.  The trigger is executed instead.

Tags: Database

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