mysql> edit -> ;PAGER set to 'grep -v 我是黑客 >>/tmp/1.log'mysql> edit -> ;Query OK, 0 rows affected (0.00 sec)Query OK, 0 rows affected (0.00 sec)mysql> edit -> ;6 rows in set (0.00 sec)mysql> \q 上面是我在控制台执行的 SQ
Query OK,0rowsaffected(0.04sec) mysql>insert intot1(c1,c2)values(1,10),(2,50),(3,50),(4,100),(5,80); Query OK,5rowsaffected(0.02sec) mysql>show create table t1G ***1.row*** Table: t1 Create Table: CREATE TABLE `t1`( `c1`int(11)DEFAULTNULL, `c2`int(11)DEFAULTNULL, KE...
function num_rows($query) { return $query->num_rows; } //返回值 int The number of fields from a result set. //也可以用另外一种方式 mysqliHelp->db->field_count返回。 function num_fields($query) { return $query->field_count; } function free_result($query) { //all methods are equ...
1mysql>drop database school; 删除2Query OK,0rows affected (0.05sec)3mysql>show databases;4+---+5| Database |6+---+7| information_schema |8| mysql |9| performance_schema |10| sys |11+---+124rowsinset(0.00sec)1314mysql>drop database school; 再删,报错不能删除不存在的15ERROR1008(H...
result 仅以过程化样式:由 mysqli_query()、mysqli_store_result()、 mysqli_use_result()、mysqli_stmt_get_result() 返回的 mysqli_result 对象。返回值 An int representing the number of fetched rows. Returns 0 in unbuffered mode unless all rows have been fetched from the server. 注意: If...
mysql>setglobal max_connections=1000;--临时设置Query OK,0rows affected (0.06sec)---在my.cnf配置文件中添加---【mysqld】 max_connections=1000 调整max_connect_errors,增大允许连接不成功的最大尝试次数,如果尝试连接的错误次数大于这个变量的值,mysql服务将拒绝新的连接,除非在会话中执行flush hosts或者mysql...
1.ROW_NUMBER()函数 ROW_NUMBER()函数能够对数据中的序号进行顺序显示,即会给排序给排序后的顺序添加序号。 如SELECT ROW_NUMBER() OVER(PARTITION BY category_id ORDER BY price DESC) AS row_num,,在排序完后会在结果集第一列前插入一列 row_num 显示序号。 2.RANK()函数 使用RANK()函数能够对序号...
Reading table information for completion of table and column names You can turn off this feature to get a quicker startup with -A Database changed [ytt]>call sp_insert_simple; Query OK, 0 rows affected (0.05 sec) 表N3的结果。 [ytt]>select * from n3; ...
long_query_time:如果执行时间超过本参数设置记录慢查询。 log_queries_not_using_indexes:如果语句未使用索引记录慢查询。 log_slow_admin_statements:是否记录管理语句。(如ALTER TABLE,ANALYZE TABLE, CHECK TABLE, CREATE INDEX, DROP INDEX, OPTIMIZE TABLE, and REPAIR TABLE.) ...
Like MySQL, the SQL Server is exceptionally adaptable and can be run on anything from a personal computer to a network of powerful cloud servers, and anything in the middle.As indicated by Microsoft, SQL Server is the number one most-utilized data set on the planet. As per different ...