29 3.1.5. Hexadecimal Format for Integer Numbers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 3.2. Floating-Point Data Types. . . . . . . . . . . . . . . . . 30 3.2.1. Approximate Floating-Point Data Types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 3.2.2. Decimal Floating-Point Types . . . . . . . . . . problems with legacy data when migrating a database from dialect 1 to 3. • In Dialect 3 databases, ◦ numbers (DECIMAL and NUMERIC data types) are stored internally as long fixed point values (scaled integers)

26 3.1.4. Hexadecimal Format for Integer Numbers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 3.2. Floating-Point Data Types. . . . . . . . . . . . . . . . problems with legacy data when migrating a database from dialect 1 to 3. • In Dialect 3 databases, ◦ numbers (DECIMAL and NUMERIC data types) are stored internally as long fixed point values (scaled integers) compact data storage of integer data for which only a narrow range of possible values is required. Numbers of the SMALLINT type are within the range from -2 16 to 2 16 - 1, that is, from -32,768 to 32

DOMAIN dm_nums AS varchar(20) CHARACTER SET UTF8 COLLATE nums_coll; -- original (manufacturer) numbers CREATE TABLE wares(id int primary key, articul dm_nums ...); См. также: DROP Accepted = 1 UNION ALL SELECT number, name FROM SuspendedMembers WHERE Vindicated = 1 INSERT INTO numbers(num) WITH RECURSIVE r(n) AS ( SELECT 1 FROM rdb$database UNION ALL SELECT n+1 FROM r where рекурсивным CTE MERGE INTO numbers USING ( WITH RECURSIVE r(n) AS ( SELECT 1 FROM rdb$database UNION ALL SELECT n+1 FROM r WHERE n < 200 ) SELECT n FROM r ) t ON numbers.num = t.n WHEN NOT MATCHED

Standardtypen von Literalen sind: integer - 0, -34, 45, 0X080000000; fixed-point - 0.0, -3.14 floating-point - 3.23e-23; string - 'text', 'don''t!'; binary string - x'48656C6C6F20776F726C64' date = 1 UNION ALL SELECT number, name FROM SuspendedMembers WHERE Vindicated = 1 INSERT INTO numbers(num) WITH RECURSIVE r(n) as ( SELECT 1 FROM rdb$database UNION ALL SELECT n+1 FROM INSERT (id, name) values (cd.id, cd.name); 3. Zusammen mit einem rekursiven CTE MERGE INTO numbers USING ( WITH RECURSIVE r(n) AS ( Chapter 6. Data Manipulation-Statements (DML) 325

then restored to reset the transaction numbers back to zero. The reason it has this maximum value is simply because the code for allocating transaction numbers uses a signed value. The C code representation this table is to be found. As described above, the pointer page holds the list of all the page numbers that belong to this table. If we look at the pointer page for our table, we see the following: irt_transaction below. In ODS versions previous to 11.0 this field holds the index selectivity in floating-point format.  From ODS version 11.0, this field is no longer used as selectivity has been moved

Float denormal operand.One of the floating-point operands is too small to represent a standard float value. -901 335544772 exception_float_divide_by_zero Floating-point divide by zero.The code attempted attempted to divide a floating-point value by zero. -901 335544773 exception_float_inexact_result Floating-point inexact result.The result of a floating-point operation cannot be represented as a deciaml exception_float_invalid_operand Floating-point invalid operand.An indeterminant error occurred during a floating-point operation. -901 335544775 exception_float_overflow Floating-point overflow.The exponent of

Float denormal operand.One of the floating-point operands is too small to represent a standard float value. -901 335544772 exception_float_divide_by_zero Floating-point divide by zero.The code attempted attempted to divide a floating-point value by zero. -901 335544773 exception_float_inexact_result Floating-point inexact result.The result of a floating-point operation cannot be represented as a Firebird 2 exception_float_invalid_operand Floating-point invalid operand.An indeterminant error occurred during a floating-point operation. -901 335544775 exception_float_overflow Floating-point overflow.The exponent of

Float denormal operand. One of the floating-point operands is too small to represent a standard float value. -901 335544772 exception_float_divide_by_zero Floating-point divide by zero. The code attempted ct_result Floating-point inexact result. The result of a floating-point operation cannot be represented as a deciaml fraction. -901 335544774 exception_float_invalid_operand Floating-point invalid operand indeterminant error occurred during a floating-point operation. -901 335544775 exception_float_overflow Floating-point overflow. The exponent of a floating-point operation is greater than the magnitude

используются. Пример: CREATE TABLE NUMBERS ( BIGNUM NUMERIC(18), SMALLNUM NUMERIC(9)) EXECUTE BLOCK ( DIVIDEND TYPE OF COLUMN NUMBERS.BIGNUM = ?, DIVISOR TYPE OF COLUMN NUMBERS.SMALLNUM = ?) RETURNS ( QUOTIENT QUOTIENT TYPE OF COLUMN NUMBERS.BIGNUM, REMAINDER TYPE OF COLUMN NUMBERS.SMALLNUM) AS BEGIN QUOTIENT = :DIVIDEND / :DIVISOR; REMAINDER = MOD (:DIVIDEND, :DIVISOR); SUSPEND; 114 Руководство по языку RETURNS( AA INTEGER, BB INTEGER, SM INTEGER, DF INTEGER) AS BEGIN FOR SELECT DISTINCT A, B FROM NUMBERS ORDER BY A, B INTO :AA, :BB DO BEGIN SM = :AA + :BB; DF = :AA - :BB; SUSPEND; END END CREATE

. . . . . . . . . . . . . . . . . 15 5.1. Using generators to give e.g. transfer files unique numbers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 5.2. Generators as “usage counters” IDs. 5.1. Using generators to give e.g. transfer files unique numbers A “classic” usage of generators is to ensure unique, sequential numbers for — well, anything in your application other than the row