SELECT COUNT(Column_4) FROM tbl_1 WHERE Column_2 = @val INTO @val3; UPDATE tbl_2 SET Col_1 = @val, Col_2 = @val2; SET counter = counter + 1; END WHILE; Subject Written By Posted How do I execute multi-select statements and update table in stored procedure ...
下面是一个使用存储过程执行多条语句的示例: DELIMITER//CREATEPROCEDUREexecute_multiple_statements()BEGINSELECT*FROMusers;SELECT*FROMorders;END//DELIMITER;CALLexecute_multiple_statements(); 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 上面的代码中,我们首先使用DELIMITER关键字指定存储过程的分隔符为//,...
SELECT ...UNION[ALL|DISTINCT] SELECT ... [UNION [ALL|DISTINCT] SELECT ...]UNIONisused to combine the resultfrommultiple SELECT statements into a single result set.URL: https://dev.mysql.com/doc/refman/8.0/en/union.html union把2个select语句的查询结果联合起来: column的数量和顺序,所有的sele...
SELECTcan also be used to retrieve rows computed without reference to any table. For example: You are permitted to specifyDUALas a dummy table name in situations where no tables are referenced: DUALis purely for the convenience of people who require that allSELECTstatements should haveFROMand pos...
设置multipleStatements属性为true 1varconnection=mysql.createConnection( { multipleStatements: true } );23connection.query('select column1; select column2; select column3;',function(err, result){4if(err){5throw err;6}else{7console.log(result[0]);//Column1asa result8console.log(result[1]);...
var connection = mysql.createConnection({multipleStatements: true}); Once enabled, you can execute multiple statement queries like any other query: connection.query('SELECT 1; SELECT 2', function (error, results, fields) { if (error) throw error; // `results` is an array with one element...
创建一个表格sql_statements,用来存储要执行的多个SQL语句。将要执行的SQL语句插入到该表格中,例如: sql_statement SELECT * FROM table1; SELECT * FROM table2 WHERE id=1; 3. 调用存储过程 最后,调用存储过程execute_multiple_sql来执行多个SQL语句: ...
Multiple-result processing also is required if you executeCALLstatements for stored procedures. Results from a stored procedure have these characteristics: Statements within the procedure may produce result sets (for example, if it executesSELECTstatements). These result sets are returned in the order ...
The SELECT statement is used to select data from a database.The data returned is stored in a result table, called the result-set.SELECT SyntaxSELECT column1, column2, ... FROM table_name; Here, column1, column2, ... are the field names of the table you want to select data from. ...
I have written several Stored Procedures which have multiple SELECT statements in order to return multiple ResultSets to the calling script. SQL script of one such procedure is as below: DELIMITER`$$ CREATE PROCEDURE `GetLists` () BEGIN ...