New SQL Features in Firebird

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The “standard” way 46 Common SQL : cursor stability ● Rows to be inserted\updated\deleted should be marked first ● Marked rows is inserted\updated\deleted then ● Pros ● rowset is stable and is not affected by DML statement itself ● Cons ● Marks should be saved somewhere and rows will be visited again, or ● Set of marked rows should be saved somewhere and this store will be visited again ● Note : this could be reached in Firebird using (well known) workaround: force query to have SORT in PLAN - it will materialize implicit cursor and make it stable Luxembourg 2011 Whats new in Firebird SQL
The Firebird 3 way 47 Common SQL : cursor stability ● Use undo-log to see if record was already modified by current cursor ● if record was inserted - ignore it ● if record was updated or deleted - read backversion ● Pros ● No additional bookkeeping required ● No additional storage required ● Relatively easy to implement ● Cons ● Inserted records could be visited (but ignored, of course) ● Backversions of updated\deleted records should be read ● Not works with SUSPEND in PSQL Luxembourg 2011 Whats new in Firebird SQL
Page 1 and 2: New SQL Features in Firebird
Page 3 and 4: ● Common SQL ● SIMILAR TO ● S
Page 5 and 6: 5 Common SQL : SQLSTATE SQLSTATE is
Page 7 and 8: 7 Common SQL : HEX literals String
Page 9 and 10: 9 Common SQL : UUID CHAR UUID_TO_C
Page 11 and 12: 11 PSQL : EXECUTE STATEMENT ● New
Page 13 and 14: 13 PSQL : EXECUTE STATEMENT -- logo
Page 15 and 16: 15 PSQL : EXECUTE STATEMENT Common
Page 17 and 18: Syntax 17 PSQL : TYPE OF COLUMN dat
Page 19 and 20: 19 ALTER VIEW \ COMPUTED FIELD Exam
Page 21 and 22: Syntax 21 DDL : USER MANAGEMENT CRE
Page 23 and 24: 23 MON$DATABASE MON$DATABASE_NAME .
Page 25 and 26: 25 MONITORING TABLES 1) Cancel curr
Page 27 and 28: ● Common SQL ● Full syntax of M
Page 29 and 30: ● DDL ● Manage nullability of c
Page 31 and 32: Full SQL 2008 syntax MERGE INTO 31
Page 33 and 34: RETURNING clause MERGE INTO 33 Com
Page 35 and 36: Common SQL : WINDOW FUNCTIONS Synta
Page 37 and 38: Syntax Rules 37 Common SQL : substr
Page 39 and 40: Syntax 39 Common SQL : BOOLEAN data
Page 41 and 42: Examples 41 Common SQL : BOOLEAN da
Page 43 and 44: Examples 43 Common SQL : BOOLEAN da
Page 45: The reason of the issue 45 Common S
Page 49 and 50: PSQL notes 49 Common SQL : cursor s
Page 51 and 52: Syntax 51 PSQL : SQL functions {CRE
Page 53 and 54: Example 53 EXECUTE BLOCK RETURNS (N
Page 55 and 56: Syntax 55 DDL : IDENTITY columns :
Page 57 and 58: 57 DDL : DDL triggers New context v
Page 59: 59 THANK YOU FOR ATTENTION Question

New SQL Features in Firebird

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