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Check constraints

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

A CHECK constraint is a simple, yet very effective means of enforcing data integrity on a row basis. Want to ensure a number is only ever positive? Use a CHECK constraint (or even a DOMAIN that contains a CHECK constraint).

// Create a new table with columns and unnamed constraints
create.createTable("table")
      .column("column1", INTEGER)
      .check(field(name("column1"), INTEGER).gt(0))
      .execute();

// Equivalent to the above
create.createTable("table")
      .column("column1", INTEGER)
      .constraints(
          check(field(name("column1"), INTEGER).gt(0))
      )
      .execute();

// Create a new table with columns and named constraints (recommended if you want to alter the constraint)
create.createTable("table")
      .column("column1", INTEGER)
      .constraints(
          constraint("chk").check(field(name("column1"), INTEGER).gt(0))
      )
      .execute();

Just like the previous constraints, this one can be used by the optimiser to remove some redundant predicates, see e.g. this blog post.

Dialect support

This example using jOOQ:

createTable("table")
      .column("column1", INTEGER)
      .constraints(
          constraint("chk").check(field(name("column1"), INTEGER).gt(0))
      )

Translates to the following dialect specific expressions:

-- ACCESS, DB2, FIREBIRD, HANA, TERADATA
CREATE TABLE table (
  column1 integer,
  CONSTRAINT chk
    CHECK (column1 > 0)
)

-- ASE, SYBASE
CREATE TABLE table (
  column1 int NULL,
  CONSTRAINT chk
    CHECK (column1 > 0)
)

-- AURORA_POSTGRES, DERBY, H2, HSQLDB, MARIADB, MYSQL, POSTGRES, SQLSERVER, VERTICA, YUGABYTEDB
CREATE TABLE table (
  column1 int,
  CONSTRAINT chk
    CHECK (column1 > 0)
)

-- COCKROACHDB
CREATE TABLE table (
  column1 int4,
  CONSTRAINT chk
    CHECK (column1 > 0)
)

-- INFORMIX
CREATE TABLE table (
  column1 integer,
  CHECK (column1 > 0) CONSTRAINT chk
)

-- ORACLE
CREATE TABLE table (
  column1 number(10),
  CONSTRAINT chk
    CHECK (column1 > 0)
)

-- SQLITE
CREATE TABLE "table" (
  column1 int,
  CONSTRAINT chk
    CHECK (column1 > 0)
)

-- AURORA_MYSQL, BIGQUERY, EXASOL, MEMSQL, REDSHIFT, SNOWFLAKE, SQLDATAWAREHOUSE
/* UNSUPPORTED */

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

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