Den här artikeln listar SQL UPDATE
syntax, som implementeras av olika databashanteringssystem (DBMS). Syntaxen är listad exakt som varje leverantör har listat den på sin webbplats. Klicka på den tillämpliga länken för att se mer information om syntaxen för en viss leverantör.
De DBMS som omfattas är MySQL, SQL Server, PostgreSQL och Oracle Database.
MySQL
Från MySQL 5.7 Reference Manual.
Syntax för en tabell:
UPDATE [LOW_PRIORITY] [IGNORE]table_reference
SETcol_name1
={expr1
|DEFAULT} [,col_name2
={expr2
|DEFAULT}] ... [WHEREwhere_condition
] [ORDER BY ...] [LIMITrow_count
]
Syntax för flera tabeller:
UPDATE [LOW_PRIORITY] [IGNORE]table_references
SETcol_name1
={expr1
|DEFAULT} [,col_name2
={expr2
|DEFAULT}] ... [WHEREwhere_condition
]
SQL-server
Från Transact-SQL-referensen:
[ 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
Från 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
Från Oracle Database Online Documentation 12c Release 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) } }
where_clause ::=
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
Uttalande
UPPDATERING uttalandet ändrar värdena för de angivna kolumnerna i alla rader som uppfyller villkoret. Endast de kolumner som ska ändras behöver inkluderas i SET klausul; kolumner som inte explicit modifierats behåller sina tidigare värden.