翻译自: https://www.poftut.com/sql-update-statement-and-query-with-examples/
UPDATEemployeesSETlastname ='Hill'WHEREemployeeID =3;Code language:SQL (Structured Query Language)(sql) Execute the SELECT statement above again to verify the change: SQL UPDATE multiple columns For example, Janet moved to a new house, therefore, her address changed. Now, you have to change ...
We can update all the rows in a table at once by omitting theWHEREclause. For example, -- update all rowsUPDATECustomersSETcountry ='NP'; Run Code Here, the SQL command changes the value of thecountrycolumn toNPfor all rows. Note:We should be cautious while using theUPDATEstatement. If...
Yet, on occasion, it may prove beneficial toalter the contents of a tableindirectly, by using a subset of data obtained from secondary query statement. 但是,有时候,通过使用从辅助查询语句获得的数据子集,来间接更改表的内容可能被证明是有益的。 Performing anUPDATEusing a secondarySELECTstatementcan be...
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 ...
}/*** 解析 statement * 这里就是 select 、update 、insert 、 delete 节点进来 * 开始解析每个语句咯 *@paramlist *@paramrequiredDatabaseId*/privatevoidbuildStatementFromContext(List<XNode>list, String requiredDatabaseId) {for(XNode context : list) {//创建解析对象finalXMLStatementBuilder statement...
Then click on First to execute the first statement and Next to execute each subsequent statement.Start transaction; Select VendId, Name from TrnVendor where VendId = 'TV001'; Update TrnVendor Set Name = 'Genie R Corp.' Where VendId = 'TV001'; Select VendId, Name from Trn...
语法： UPDATE 表名称 SET 列名称 = 新值 WHERE 列名称 = 某值 Person: LastNameFirstNameAddre...
INSERT INTO SELECT Syntax The syntax of the SQLINSERT INTO SELECTstatement is: INSERTINTOdestination_table (column1, column2, column3, ...)SELECTcolumn1, column2, column3, ...FROMsource_table; Here, destination_tableis the name of the table where the data is to be inserted ...
1– Update with From Join Works with: SQL Server (not MySQL, Oracle, PostgreSQL) This version of the Update statement uses a Join in the FROM clause. It’s similar to other statements like Select and allows you to retrieve the value from one table and use it as a value to update in...