sql - Before Update Trigger Issues -



sql - Before Update Trigger Issues -

i'm trying create trigger accomplishes following

examines value of field action_type in row having update requested

if row (prior update) has action_type that's null, want insert value/string "change".

if row (prior update) has action_type contains string 'add', want maintain value in-tact.

if row (prior update) has action_type contains string 'change', want maintain value in-tact.

create trigger tbl8_change on holiday_date_table before update begin if ((select action_type holiday_date_table inserted.hid = holiday_date_table.hid) == null) insert holiday_date_table (action_type) values ('changed') inserted.hid = holiday_date_table.hid; if ((select action_type holiday_date_table inserted.hid = holiday_date_table.hid) == 'changed') insert holiday_date_table (action_type) values ('changed') inserted.hid = holiday_date_table.hid; if ((select action_type holiday_date_table inserted.hid = holiday_date_table.hid) == 'add') insert holiday_date_table (action_type) values ('add') inserted.hid = holiday_date_table.hid; end

my syntax little off, help appreciated.

you can utilize after trigger same effect;

create trigger trg_hdt on holiday_date_table after update begin update hdt set hdt.action_type='change' holiday_date_table hdt bring together inserted on hdt.id = i.id hdt.action_type null end;

an sqlfiddle test with.

basically bring together updated rows table itself, , alter appropriate value of matches.

sql sql-server-2012

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