floor(x): Returns the largest whole integer not greater than x (rounds down) : floor « Math Functions « PostgreSQL

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PostgreSQL » Math Functions » floor 
floor(x): Returns the largest whole integer not greater than x (rounds down)


postgres=#
postgres=#
postgres=# -- floor(x): Returns the largest whole integer not greater than x (rounds down)
postgres=# SELECT floor(1.0AS one,
postgres-#        floor(1.1AS "one point one",
postgres-#        floor(1.8AS "one point eight";
 one | one point one | one point eight
-----+---------------+-----------------
   |             |               1
(row)

postgres=#
           
       
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1.floor(dp or numeric) largest integer not greater than argument
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