CREATE TABLE TestBatch (ColA INT PRIMARY KEY, ColB CHAR(3)); GO INSERT INTO TestBatch VALUES (1, 'aaa'); INSERT INTO TestBatch VALUES (2, 'bbb'); INSERT INTO TestBatch VALUES (1, 'ccc'); -- Duplicate key error. GO SELECT * FROM TestBatch; -- Returns rows 1 ...
Server: Msg 3604, Level 16, State 1, Line 5 Duplicate key was ignored. Number of rows --- 38 请注意,从 Production.UnitMeasure 表中插入的、不违反唯一性约束的行将成功插入。 会发出警告并忽略重复行,但不会回滚整个事务。 将再次执行相同语句,但将 IGNORE_DUP_KEY 设置为 OFF。 SQL 复制 CREA...
INNER JOIN:如果表中有至少一个匹配,则返回行 LEFT JOIN:即使右表中没有匹配,也从左表返回所有的行 RIGHT JOIN:即使左表中没有匹配,也从右表返回所有的行 FULL JOIN:只要其中一个表中存在匹配,则返回行 SQL INNER JOIN SQL INNER JOIN关键字 INNER JOIN 关键字在表中存在至少一个匹配时返回行。 SQL INNER...
SELECT DEFINITION, type FROM sys.sql_modules AS m INNER JOIN sys.objects AS o ON m.object_id = o.object_id AND type IN ('FN', 'IF', 'TF'); GO The definition of functions created by using the ENCRYPTION option can't be viewed by using sys.sql_modules; however, other information...
Using the rowset as a source table in theFROMclause of a query, where the sort and join columns match. UNIQUE Specifies that the data file doesn't have duplicate entries. If the actual rows in the data file aren't sorted according to the order that is specified, or if theUNIQUEhint ...
To ensure that only 10 rows are deleted, the column specified in the subselect statement (PurchaseOrderID) is the primary key of the table. Using a nonkey column in the subselect statement might result in the deletion of more than 10 rows if the specified column contains duplicate values. ...
A SELECT INTO statement always creates a single-threaded insert operation. A SELECT INTO statement can create a parallel insert operation. When inserting a large number of rows, the parallel operation can improve performance. Differences between lower compatibility levels and levels 100 and 110 This ...
SQL JOIN Logic:(Check wikipedia formore detail …) A SQL join without a relationship creates what’s known as a Cartesian Product, which is a result set that consists of all rows from one table matched with all row in another table. This type of join is also known as aCROSS JOIN. ...
hivaland:lovalare guaranteed to be mutually exclusive, only one half of theUNIONALLactually returns rows. (TheALLinUNIONALLis logically valid because of this exclusivity. It allows the plan to be carried out without an expensive sort to rule out duplicate rows for the two halves of the query...
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