SQL UPDATE Syntaks – Listet af DBMS

Denne artikel viser SQL'en UPDATE syntaks, som implementeret af forskellige databasestyringssystemer (DBMS'er). Syntaksen er angivet nøjagtigt som hver leverandør har angivet den på deres hjemmeside. Klik på det relevante link for at se flere detaljer om syntaksen for en bestemt leverandør.

De dækkede DBMS'er er MySQL, SQL Server, PostgreSQL og Oracle Database.

MySQL

Fra MySQL 5.7 Reference Manual.

Enkeltbordssyntaks:

UPDATE [LOW_PRIORITY] [IGNORE] table_reference
    SET col_name1={expr1|DEFAULT} [, col_name2={expr2|DEFAULT}] ...
    [WHERE where_condition]
    [ORDER BY ...]
    [LIMIT row_count]

Syntaks for flere tabeller:

UPDATE [LOW_PRIORITY] [IGNORE] table_references
    SET col_name1={expr1|DEFAULT} [, col_name2={expr2|DEFAULT}] ...
    [WHERE where_condition]

SQL-server

Fra Transact-SQL-referencen:

[ WITH <common_table_expression> [...n] ]
UPDATE 
    [ TOP ( expression ) [ PERCENT ] ] 
    { { table_alias | <object> | rowset_function_limited 
         [ WITH ( <Table_Hint_Limited> [ ...n ] ) ]
      }
      | @table_variable    
    }
    SET
        { column_name = { expression | DEFAULT | NULL }
          | { udt_column_name.{ { property_name = expression
                                | field_name = expression }
                                | method_name ( argument [ ,...n ] )
                              }
          }
          | column_name { .WRITE ( expression , @Offset , @Length ) }
          | @variable = expression
          | @variable = column = expression
          | column_name { += | -= | *= | /= | %= | &= | ^= | |= } expression
          | @variable { += | -= | *= | /= | %= | &= | ^= | |= } expression
          | @variable = column { += | -= | *= | /= | %= | &= | ^= | |= } expression
        } [ ,...n ] 

    [ <OUTPUT Clause> ]
    [ FROM{ <table_source> } [ ,...n ] ] 
    [ WHERE { <search_condition> 
            | { [ CURRENT OF 
                  { { [ GLOBAL ] cursor_name } 
                      | cursor_variable_name 
                  } 
                ]
              }
            } 
    ] 
    [ OPTION ( <query_hint> [ ,...n ] ) ]
[ ; ]

<object> ::=
{ 
    [ server_name . database_name . schema_name . 
    | database_name .[ schema_name ] . 
    | schema_name .
    ]
    table_or_view_name}

PostgreSQL

Fra PostgreSQL 9.5-manualen:

[ WITH [ RECURSIVE ] with_query [, ...] ]
UPDATE [ ONLY ] table_name [ * ] [ [ AS ] alias ]
    SET { column_name = { expression | DEFAULT } |
          ( column_name [, ...] ) = ( { expression | DEFAULT } [, ...] ) |
          ( column_name [, ...] ) = ( sub-SELECT )
        } [, ...]
    [ FROM from_list ]
    [ WHERE condition | WHERE CURRENT OF cursor_name ]
    [ RETURNING * | output_expression [ [ AS ] output_name ] [, ...] ]

Oracle-database

Fra Oracle Database Online Documentation 12c Udgivelse 1 (12.1):

UPDATE [ hint ]
   { dml_table_expression_clause
   | ONLY (dml_table_expression_clause)
   } [ t_alias ]
   update_set_clause
   [ where_clause ]
   [ returning_clause ]
   [error_logging_clause] ;

 DML_table_expression_clause::=

{ [ schema. ]
  { table
    [ partition_extension_clause
    | @ dblink
    ]
  | { view | materialized view } [ @ dblink ]
  }
| ( subquery [ subquery_restriction_clause ] )
| table_collection_expression
}

partition_extension_clause::=

{ PARTITION (partition)
| PARTITION FOR (partition_key_value [, partition_key_value]...)
| SUBPARTITION (subpartition)
| SUBPARTITION FOR (subpartition_key_value [, subpartition_key_value]...)
}

subquery_restriction_clause ::=

WITH { READ ONLY
     | CHECK OPTION 
     } [ CONSTRAINT constraint ]

table_collection_expression ::=

TABLE (collection_expression) [ (+) ]

update_set_clause ::=

SET
{ { (column [, column ]...) = (subquery)
  | column = { expr | (subquery) | DEFAULT }
  }
     [, { (column [, column]...) = (subquery)
        | column = { expr | (subquery) | DEFAULT }
        }
     ]...
| VALUE (t_alias) = { expr | (subquery) }
}

hvor_klausul ::=

WHERE condition

returning_clause::=

{ RETURN | RETURNING } expr [, expr ]...
INTO data_item [, data_item ]...

error_logging_clause::=

LOG ERRORS 
  [ INTO [schema.] table ]
  [ (simple_expression) ]
  [ REJECT LIMIT { integer | UNLIMITED } ]

Om UPDATE Erklæring

 OPDATERING sætning ændrer værdierne for de angivne kolonner i alle rækker, der opfylder betingelsen. Kun de kolonner, der skal ændres, skal medtages i SET klausul; kolonner, der ikke er eksplicit ændret, bevarer deres tidligere værdier.