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REPEAT statement

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

WHILE's lesser known little sibling is REPEAT, which works the same way as Java's do statement. It is mostly not as useful as WHILE, but can be, occasionally, when a loop must be iterated at least once.

An example:

-- MySQL syntax
REPEAT
  INSERT INTO t (col) VALUES (i);
  SET i = i + 1;
UNTIL i > 10 END REPEAT;
// All dialects
Variable<Integer> i = var("i", INTEGER);
repeat(
  insertInto(T).columns(T.COL).values(i),
  i.set(i.plus(1))
).until(i.gt(10))

Dialect support

This example using jOOQ:

repeat(deleteFrom(BOOK).where(BOOK.ID.eq(i)), i.set(i.plus(1))).until(i.gt(10))

Translates to the following dialect specific expressions:

Aurora Postgres

<<alias_2>>
LOOP
  DELETE FROM BOOK
  WHERE BOOK.ID = i;
  SET i = (i + 1);
  EXIT alias_2 WHEN i > 10;
END LOOP

BigQuery

REPEAT
  DELETE FROM BOOK
  WHERE (
    BOOK.ID = i
    AND TRUE
  );
  SET i = (i + 1);
UNTIL i > 10 END REPEAT

DB2, HSQLDB, MariaDB, MySQL

REPEAT
  DELETE FROM BOOK
  WHERE BOOK.ID = i;
  SET i = (i + 1);
UNTIL i > 10 END REPEAT

Exasol

REPEAT
  DELETE FROM BOOK
  WHERE BOOK.ID = i;
  i := (i + 1);
UNTIL i > 10 END REPEAT

Firebird

alias_2:
WHILE (1 = 1) DO BEGIN
  DELETE FROM BOOK
  WHERE BOOK.ID = :i;
  :i = (:i + 1);
  IF (:i > 10) THEN
    LEAVE alias_2;
END

H2

do {
  try (PreparedStatement s = c.prepareStatement(
    "DELETE FROM BOOK\n" +
    "WHERE BOOK.ID = ?"
  )) {
    s.setObject(1, i);
    s.execute();
  }
  i = (i + 1);
}
while (!(i > 10))

Hana

WHILE 1 = 1 DO
  DELETE FROM BOOK
  WHERE BOOK.ID = i;
  i = (i + 1);
  IF i > 10 THEN
    BREAK;
  END IF;
END WHILE

Informix

<<alias_2>>
LOOP
  DELETE FROM BOOK
  WHERE BOOK.ID = i;
  LET i = (i + 1);
  EXIT alias_2 WHEN i > 10;
END LOOP

Oracle, Postgres, YugabyteDB

<<alias_2>>
LOOP
  DELETE FROM BOOK
  WHERE BOOK.ID = i;
  i := (i + 1);
  EXIT alias_2 WHEN i > 10;
END LOOP

ASE, Access, Aurora MySQL, CockroachDB, Derby, DuckDB, MemSQL, Redshift, SQLDataWarehouse, SQLServer, SQLite, Snowflake, Sybase, Teradata, Trino, Vertica

/* UNSUPPORTED */

(These are currently generated with jOOQ 3.20, see #10141), or translate your own on our website

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