中国华的博客

安装命令：$/home/hlh/software/mysql-8.0.18/bin/mysqld --defaults-file=/home/hlh/software/mysql-8.0.18/config/my.cnf --initialize --user=hlh --basedir=/home/hlh/software/mysql-8.0.18/ --datadir=/home/hlh/s...

select COALESCE(NULLIF(trim(REGIONALISM), ‘’), null) from uods.MD_COMPANY