nodejs中npm常见的命令 npm主要是node包管理和发布的工具。 npm官网网址:npm | Homehttps://www.npmjs.com/官网英文文档: npm DocsDocumentation for the npm registry, website, and command-line interfacehttps://docs.npmjs.com/about-npm官网中文文…
1. 查表中数据个数
select count(*) from table_name where condition
2. 删除表中数据
delete from table_name where condition
3.筛选符合条件数据并且将结果根据条件公式求和
SELECTsum(case when transaction_state B then transaction_amountwhen transaction_stat…
异常日志(全文):
Init SDKMan
Found Android manifest
Android SDK version: . Build tools:
Found gradle
Gradle build script
WARNING: gradle/wrapper/gradle-wrapper.jar does not exist! Needs to be committed.ERROR: Gradle wrapper not found. Please ad…
假设执行下面的sql语句
update tb_user set age age 1;以MySQL为例,按照两阶段锁协议,会先给tb_user加上表意向锁,然后对tb_user的所有行加上行锁,但是当tb_user数据量非常多的时候,频繁的获取行锁会影响性能&#…