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Nullability

Applies to ✅ Open Source Edition   ✅ Express Edition   ✅ Professional Edition   ✅ Enterprise Edition

Nullability is a property of a data type, and as such can be attached to the data type using various methods. The default nullability is RDBMS specific, so if you want to be vendor agnostic about nullability in your DDL, better always state it explicitly, for example:

// Specify nullability on columns
create.createTable("table")
      .column("vendor_specific_default", INTEGER)
      .column("explicit_nullable", INTEGER.null_())
      .column("explicit_not_nullable", INTEGER.notNull())
      .execute();

Dialect support

This example using jOOQ:

createTable("table")
      .column("vendor_specific_default", INTEGER)
      .column("explicit_nullable", INTEGER.null_())
      .column("explicit_not_nullable", INTEGER.notNull())

Translates to the following dialect specific expressions:

-- ACCESS, DB2, HANA, INFORMIX, TERADATA
CREATE TABLE table (
  vendor_specific_default integer,
  explicit_nullable integer NULL,
  explicit_not_nullable integer NOT NULL
)

-- ASE, SYBASE
CREATE TABLE table (
  vendor_specific_default int NULL,
  explicit_nullable int NULL,
  explicit_not_nullable int NOT NULL
)

-- AURORA_MYSQL, AURORA_POSTGRES, EXASOL, H2, MARIADB, MEMSQL, MYSQL, POSTGRES, REDSHIFT, SQLDATAWAREHOUSE, SQLSERVER, 
-- VERTICA, YUGABYTEDB
CREATE TABLE table (
  vendor_specific_default int,
  explicit_nullable int NULL,
  explicit_not_nullable int NOT NULL
)

-- BIGQUERY
CREATE TABLE table (
  vendor_specific_default int64,
  explicit_nullable int64,
  explicit_not_nullable int64 NOT NULL
)

-- COCKROACHDB
CREATE TABLE table (
  vendor_specific_default int4,
  explicit_nullable int4 NULL,
  explicit_not_nullable int4 NOT NULL
)

-- DERBY, HSQLDB
CREATE TABLE table (
  vendor_specific_default int,
  explicit_nullable int,
  explicit_not_nullable int NOT NULL
)

-- FIREBIRD
CREATE TABLE table (
  vendor_specific_default integer,
  explicit_nullable integer,
  explicit_not_nullable integer NOT NULL
)

-- ORACLE, SNOWFLAKE
CREATE TABLE table (
  vendor_specific_default number(10),
  explicit_nullable number(10) NULL,
  explicit_not_nullable number(10) NOT NULL
)

-- SQLITE
CREATE TABLE "table" (
  vendor_specific_default int,
  explicit_nullable int NULL,
  explicit_not_nullable int NOT NULL
)

(These are currently generated with jOOQ 3.18, see #10141), or translate your own on our website

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