在这种情况下，一般的方法是将逗号分隔的列表解析为Oracle集合，并在SQL语句中使用该集合，Tom Kyte在他...
在这种情况下，一般的方法是将逗号分隔的列表解析为Oracle集合，并在SQL语句中使用该集合，Tom Kyte在他...
mysql> insert into t1(a,b) select '3','r5' on duplicate key update b='r5'; Query OK, 2 rows affected, 1 warning (0.19 sec) Records: 1 Duplicates: 1 Warnings: 1 mysql> select * from t1; +---+---+---+ | a | b | c | +---+---+---+ | 1 | c3 | c2 | | 2 ...
1 Replace into ... 1.1 录入原始数据mysql> use test; Database changed mysql> mysql> CREATE TABLE t1 SELECT 1 AS a, 'c3' AS b, 'c2' AS c; ALTER TABLE t1 CHANGE a a INT PRIMARY KEY AUTO_INCREMENT ; Query OK, 1 row affected (0.03 sec) Records: 1 Duplicates: 0 Warnings: 0 mysq...
在这种情况下，一般方法是将逗号分隔列表解析为Oracle集合，并在SQL语句中使用该集合。 Tom Kyte在他对...
4 rows in set (0.00 sec) 【】a=5时候,原来的c值还在,这表示当key有时,只执行后面的udate操作语句. 2.2 再检查auto_increment情况。 mysql> insert into t1(a,b) select '3','r5' on duplicate key update b='r5'; Query OK, 2 rows affected, 1 warning (0.19 sec) ...
TheREPLACE()function in Oracle is generally used to replace all occurrences of a specified string in a string with another string. It normally takes three arguments: the first is the string to replace a sequence of characters in, the second argument is the string that we want to replace, an...
在Oracle中有merge into的语法,可以达到一个语句完成同时修改,添加数据的功能,MySQL里面没有merge into的语法,却有replace into。我们来看看replace into的使用细则。为了方便演示,我首先创建一个表 users create table users( user_id i...
REPLACE('Remove spaces in this text', ' ', '') AS "New String" FROM -- Use the DUAL table, a special dummy table in Oracle, for single row operations DUAL; Explanation: This SQL query uses the REPLACE function to eliminate all spaces from the string 'Remove spaces in this text'. ...
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