查询数据库表
通过查询informatION_SCHEMA.TABLES查询数据库表的结构信息
SELECT * FROM informatION_SCHEMA.TABLES
WHERE TABLE_NAME =’table_name’ and TABLE_SCHEMA = 'database_name'
-- 查询所有表所有列名
SELECT COLUMN_NAME,TABLE_NAME,TABLE_SCHEMA,COLUMN_COMMENT FROM informatION_SCHEMA.COLUMNS where TABLE_SCHEMA like 'ykee%';
查询结果导出文件
在查询语句后面加上into outfile 文件路径,可将查询结果导出到文件,文件格式自定
SELECT CONCAT('delete from ',';') FROM informatION_SCHEMA.TABLES
WHERE TABLE_NAME like 'dep_system_doc%' and TABLE_SCHEMA = 'acm_gaj'
into outfile "d://clear_dep_system_doc_.xls";
连表修改
UPDATE trc_track t,cst_customer c
SET t.org_id = c.org_id
WHERE t.org_id is null and t.customer_id = c.id
-- 清除前缀空格
select dic_key from kn_bc_dictionary where dic_key like'% ';
select SUBSTR(dic_key FROM 1 FOR LENGTH(dic_key)-1) from kn_bc_dictionary where dic_key like'% ';
-- 清除后缀空格
select dic_key from kn_bc_dictionary where dic_key like' %';
select SUBSTR(dic_key FROM 2 FOR LENGTH(dic_key)) from kn_bc_dictionary where dic_key like' %';
-- 中间空格改为下划线
select dic_key from kn_bc_dictionary where dic_key like'% %';
select dic_key,REPLACE(dic_key,' ','_') from kn_bc_dictionary where dic_key like'% %';
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