Let’s move on and look at another example to see how we can update multiple rows at once. This time, we’ll also use expressions from SQL UPDATE syntax which is a really handy way of setting a column equals to itself AKA doing something to a column on itself. Use the query below t...
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. Eac...
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. Eac...
Changes existing data in one or more columns in a table or view in SQL Server 2008 R2. For examples, see Examples. Transact-SQL Syntax Conventions Syntax Copy [ WITH <common_table_expression> [...n] ] UPDATE [ TOP ( expression ) [ PERCENT ] ] { { table_alias | | rowset_funct...
SQL UPDATE TABLE Syntax UPDATEtable_nameSETcolumn1 = value1, column2 = value2, ... [WHEREcondition]; Here, table_nameis the name of the table to be modified column1, column2, ...are the names of the columns to be modified
syntaxsql 複製 WITH ( [ [ , ] ...n ] ) ::= { NOEXPAND | INDEX ( <index_value> [ , ...n ] ) | INDEX = ( <index_value> ) | FORCESEEK [ ( <index_value> ( <index_column_name> [ , ... ] ) ) ] | FORCESCAN | HOLDLOCK | NOLOCK | NOWAIT | PAGLOCK | READCOMM...
SQLRETURN SQLColumns( SQLHSTMT StatementHandle, SQLCHAR * CatalogName, SQLSMALLINT NameLength1, SQLCHAR * SchemaName, SQLSMALLINT NameLength2, SQLCHAR * TableName, SQLSMALLINT NameLength3, SQLCHAR * ColumnName, SQLSMALLINT NameLength4); 参数...
SQL_MAX_COLUMNS_IN_INDEX 2.0 一个SQLUSMALLINT 值,该值指定索引中允许的最大列数。 如果没有指定的限制或限制未知,则此值设置为零。 SQL_MAX_COLUMNS_IN_ORDER_BY 2.0 一个SQLUSMALLINT 值,该值指定 ORDER BY 子句中允许的最大列数。 如果没有指定的限制或限制未知,则此值设置为零。符合FIPS 入口级别...
Syntax Copy COLUMNS_UPDATED ( ) Return Types varbinary Remarks COLUMNS_UPDATED tests for UPDATE or INSERT actions performed on multiple columns. To test for UPDATE or INSERT attempts on one column, useUPDATE(). COLUMNS_UPDATED returns one or more bytes that are ordered from left to right, with...
Exclusive (X) Used for data-modification operations, such as INSERT, UPDATE, or DELETE. Ensures that multiple updates cannot be made to the same resource at the same time. Intent Used to establish a lock hierarchy. The types of intent locks are: intent shared (IS), intent exclusive (IX)...