■ SQL Server에서 PostgreSQL로 마이그레이션하는 경우 데이터 타입을 변경하는 방법을 보여준다.
▶ 데이터 타입
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─────────────────────────────────────────────────── SQL Server PostgreSQL ─────────── ──────────────────────── ────────────── BIGINT 64-bit integer BIGINT BINARY(n) Fixed-length byte string BYTEA BIT 1, 0 or NULL BOOLEAN CHAR(n), CHARACTER(n) Fixed-length character string, 1 ← n ← 8000 CHAR(n), CHARACTER(n) DATE Date (year, month and day) DATE DATETIME Date and time with fraction TIMESTAMP(3) DATETIME2(p) Date and time with fraction TIMESTAMP(p) DATETIMEOFFSET(p) Date and time with fraction and time zone TIMESTAMP(p) WITH TIME ZONE DECIMAL(p,s), DEC(p,s) Fixed-point number DECIMAL(p,s), DEC(p,s) DOUBLE PRECISION Double-precision floating-point number DOUBLE PRECISION FLOAT(p) Floating-point number DOUBLE PRECISION IMAGE Variable-length binary data, ← 2G BYTEA INT, INTEGER 32-bit integer INT, INTEGER MONEY 64-bit currency amount MONEY NCHAR(n) Fixed-length Unicode UCS-2 string CHAR(n) NTEXT Variable-length Unicode UCS-2 data, ← 2G TEXT NUMERIC(p,s) Fixed-point number NUMERIC(p,s) NVARCHAR(n) Variable-length Unicode UCS-2 string VARCHAR(n) NVARCHAR(max) Variable-length Unicode UCS-2 data, ← 2G TEXT REAL Single-precision floating-point number REAL ROWVERSION Automatically updated binary data BYTEA SMALLDATETIME Date and time TIMESTAMP(0) SMALLINT 16-bit integer SMALLINT SMALLMONEY 32-bit currency amount MONEY TEXT Variable-length character data, ← 2G TEXT TIME(p) Time (hour, minute, second and fraction) TIME(p) TIMESTAMP Automatically updated binary data BYTEA TINYINT 8-bit unsigned integer, 0 to 255 SMALLINT UNIQUEIDENTIFIER 16-byte GUID (UUID) data CHAR(16) VARBINARY(n) Variable-length byte string, 1 ← n ← 8000 BYTEA VARBINARY(max) Variable-length binary data, ← 2G BYTEA VARCHAR(n) Variable-length character string, 1 ← n ← 8000 VARCHAR(n) VARCHAR(max) Variable-length character data, ← 2G TEXT XML XML data XML ─────────────────────────────────────────────────── |
▶ 함수
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────────────────────────────────────────────── SQL Server PostgreSQL ──────────── ─────────────────── ───────────── DATEADD Add an interval to datetime INTERVAL expression ISNULL(exp, replacement) Replace NULL with the specified value COALESCE(exp, replacement) ────────────────────────────────────────────── |