The UPDATE Statement is used to modify the existing rows in a table.The Syntax for SQL UPDATE Command is: UPDATE table_name SET column_name1 = value1, column_name2 = value2, ... [WHERE condition] table_name - the table name which has to be updated. column_name1, column_name2...
The UPDATE statement allows you to update a single record or multiple records in a table. The syntax the UPDATE statement is: UPDATE table SET column = expression WHERE predicates; Example #1 - Simple example Let's take a look at a very simple example. UPDATE supplier SET name = 'HP' WH...
UPDATE "D:\Data\orders.dbf" SET order_amt=0 WHERE NOT EMPTY(to_city) AND cust_id IS NULL Update the field with the results of another query: UPDATE "D:\Data\orders.dbf" SET order_amt= (SELECT SUM(unit_price) FROM "D:\Data\orditems.dbf" WHERE orditems.order_id IS NOT NULL) U...
The SQL Server (Transact-SQL) UPDATE statement is used to modify the existing records in a table. A WHERE clause can be used with the UPDATE statement to ...
Multiple-tablesyntax:#多表修改语句结构UPDATE[LOW_PRIORITY][IGNORE]table_referencesSETassignment_list[WHERE where_condition]Forthesingle-tablesyntax, theUPDATEstatement updates columnsofexisting rowsinthe namedtablewithnewvalues. TheSETclause indicates which columnstomodifyandthevaluesthey should be given. ...
UPDATEtable_name SETcolumn1=value1,column2=value2, ... WHEREcondition; Note:Be careful when updating records in a table! Notice theWHEREclause in theUPDATEstatement. TheWHEREclause specifies which record(s) that should be updated. If you omit theWHEREclause, all records in the table will be...
Just like the SELECT statement, you need to specify columns and a table, but the UPDATE statement also requires the new data you want to store. This data can be dynamic or static, but as in introduction, well use static strings or numbers to change data
-- update a single value in the given rowUPDATECustomersSETfirst_name ='Johnny'WHEREcustomer_id =1; Run Code Here, the SQL command changes the value of thefirst_namecolumn toJohnnyifcustomer_idis equal to1. Example: SQL UPDATE Statement ...
第八十二章 SQL命令 UPDATE(一) 为指定表中的指定列设置新值。 大纲 UPDATE [%keyword] table-ref [[AS] t-alias] value-assignment-statement [FROM [optimize-option] select-table [[AS] t-alias] {, select-table2 [[AS] t-alias]} ] [WHERE condition-expression] UPDATE [%keyword] table-ref ...
The UPDATE statement modifies values of table rows. For each row to be modified, the UPDATE statement changes the values of the columns in the SET clause, assigning a constant to the associated column. If the WHERE clause is omitted, the UPDATE statement