TRUNC

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

The TRUNC() function rounds a numeric value to its nearest integer (or optionally, to a specific decimal precision) that is closer to zero.

SELECT 
  trunc(1.7), 
  trunc(-1.7);

create.select(
  trunc(1.7), 
  trunc(-1.7)).fetch();

The result being

+-------+-------+
| trunc | trunc |
+-------+-------+
|     1 |    -1 |
+-------+-------+

Dialect support

This example using jOOQ:

trunc(1.7)

Translates to the following dialect specific expressions:

-- ASE
CASE WHEN sign(1.7E0) >= 0 THEN (floor((1.7E0 * 1)) / 1) ELSE (ceiling((1.7E0 * 1)) / 1) END

-- AURORA_MYSQL, MARIADB, MEMSQL, MYSQL
truncate(1.7E0, 0)

-- AURORA_POSTGRES, POSTGRES
CAST(trunc(CAST(1.7E0 AS numeric), 0) AS double precision)

-- BIGQUERY, CUBRID, DB2, EXASOL, FIREBIRD, HSQLDB, INFORMIX, INGRES, ORACLE, TERADATA, VERTICA
trunc(1.7E0, 0)

-- DERBY
CASE WHEN sign(1.7E0) >= 0 THEN (floor((1.7E0 * 1)) / 1) ELSE (ceil((1.7E0 * 1)) / 1) END

-- H2
truncate(CAST(1.7E0 AS double), 0)

-- HANA
round(1.7E0, 0, round_down)

-- SQLDATAWAREHOUSE, SQLSERVER
round(1.7E0, 0, 1)

-- SYBASE
truncnum(1.7E0, 0)

-- ACCESS, COCKROACHDB, IGNITE, REDSHIFT, SNOWFLAKE, SQLITE
/* UNSUPPORTED */

(These are currently generated with jOOQ 3.15, see #10141)

The jOOQ User Manual : SQL building : Column expressions : Numeric functions : TRUNC

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