Using SQL Sequences in PHP - Example After issuing a query that generates an AUTO_INCREMENT value, retrieve the value by calling mysql_insert_id( ): mysql_query ("INSERT INTO INSECT (name,date,origin) VALUES('moth','2001-09-14','windowsill')", $conn_id); $seq = mysql_insert_id ...
CREATE TABLE example_table ( id INT AUTO_INCREMENT PRIMARY KEY, name VARCHAR(255) ); 每次插入新记录时,id列会自动增加。 2. 使用自定义函数 可以创建一个自定义函数来模拟序列的行为。 代码语言:txt 复制 DELIMITER $$ CREATE FUNCTION next_val(seq_name VARCHAR(50)) RETURNS INT BEGIN DECLARE val ...
Because the sequence will not cycle, theNEXT VALUE FORfunction will result in an error when the sequence exceeds 200. B. Restarting a sequence The following example creates a sequence named CountBy1. The sequence uses the default values. ...
A. Using a sequence number in a single table The following example creates a schema named Test, a table named Orders, and a sequence named CountBy1, and then inserts rows into the table using the NEXT VALUE FOR function. SQL CREATESCHEMATest; GOCREATETABLETest.Orders ( OrderIDINTPRIMARYKEY...
SQL - Having Clause SQL - AND & OR SQL - BOOLEAN (BIT) Operator SQL - LIKE Operator SQL - IN Operator SQL - ANY, ALL Operators SQL - EXISTS Operator SQL - CASE SQL - NOT Operator SQL - NOT EQUAL SQL - IS NULL SQL - IS NOT NULL SQL - NOT NULL SQL - BETWEEN Operator SQL -...
Oracle performs some validations. For example, a newMAXVALUEcannot be imposed that is less than the current sequence number. See Also: CREATE SEQUENCEfor information on creating a sequence DROP SEQUENCEfor information on dropping and re-creating a sequence ...
Example 2:The following example shows how to create and use a sequence named "order_seq" in a table named "orders": CREATE SEQUENCE ORDER_SEQ START WITH 1 INCREMENT BY 1 NO MAXVALUE NO CYCLE CACHE 20; INSERT INTO ORDERS (ORDERNO, CUSTNO) ...
SQL> create sequence seq_1 nocache; 序列已创建。 SQL> set timing on; SQL> declare 2 x number; 3 begin 4 for i in 1 .. 10000 loop 5 select seq_1.nextval into x from dual; 6 end loop; 7 end; 8 / PL/SQL 过程已成功完成。
Reimport the CLOB and SQL NCHAR columns. Restrictions: You must have SYSDBA system privilege, and you must start up the database in restricted mode (for example, with the SQL*Plus STARTUP RESTRICT command). The current character set must be a strict subset of the character set to whic...
The JDBC driver supports function escape sequences in SQL statements with the following syntax: SQL {fn functionName} wherefunctionNameis a function supported by the JDBC driver. For example: SQL SELECT{fnUCASE(Name)}FROMEmployee The following table lists the various functions that are supported ...