一、查看pg 表字段‘名称’、‘类型’、‘非空’、‘注释’ SELECT a.attname as 字段名, format_type(a.atttypid,a.atttypmod) as 类型, a.attnotnull as 非空, col_description(a.attrelid,a.attnum) as 注释 FROM pg_class as c,pg_attribute
一、利用表数据信息查询表和字段信息 (一)从pg_tables中查询表信息 selecttablenamefrompg_tableswhereschemaname='ap'andtablenameSIMILARTO'dwd_[a-z,_]+_[0-9]+' (二)从pg_class和pg_attribute根据指定的表名查询字段信息 SELECTC.relname, A.attnameASNAME, A.attnotnullASNOTNULL, format_type ( A...
format_type(a.atttypid, a.atttypmod) as atttype, (SELECT substring(pg_catalog.pg_get_expr(d.adbin, d.adrelid, true) for 128) FROM pg_catalog.pg_attrdef d WHERE d.adrelid = a.attrelid AND d.adnum = a.attnum AND a.atthasdef) as attdefault, a.attnotnull, (SELECT c.coll...
EXECUTE format('CREATE TABLE tab_%s (LIKE tab INCLUDING INDEXES)', dateStr); EXECUTE format('ALTER TABLE tab ATTACH PARTITION tab_%s FOR VALUES IN (%L)', dateStr, dateStr); RETURN1; END; $$; CREATE EXTENSION pg_cron; SELECT cron.schedule('0 14 * * *',$$SELECT create_...
concat_ws('',t.typname,SUBSTRING(format_type(a.atttypid,a.atttypmod) from '(.*)')) as "字段类型" FROM pg_class as c, pg_attribute as a, pg_type as t WHERE c.relname = 't_batch_task' and a.atttypid = t.oid and a.attrelid = c.oid ...
格式:TO_NUMBER(value,format) select to_number('456.432','9999D999') from 1. 1.4.TO_TIMESTAMP: 功能:将字符串转换为时间戳变量,使用方法与TO_DATE相似。 1.5 CAST(value AS type): 功能:将一个变量值转换为第二个参数的类型 例如:select cast('03-4月-2008' as DATE) FROM DUAL; ...
ACCEPT variable [datatype] [FORMAT format] [PROMPT text] [HIDE 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 19. 20. 21. 22. 23. 常用系统函数: SQL函数:单行函数 分组函数 分析函数 单行函数:对于从表中查询的每一行只返回一个值 ...
format_type ( type oid, typemod integer ) → text 返回由其类型OID和可能的类型修饰符标识的数据类型的SQL名称。如果没有已知的类型修饰符,则传递NULL值给类型修饰符。 pg_get_constraintdef ( constraint oid [, pretty boolean ] ) → text 重构为了约束的创建命令。(这是一个反编译的重构,而不是命令的...
format($_$select setval('%I.%I'::regclass, %s);$_$, nsp, rel, val+1); end loop; end; $$; 说明 执行以上命令输出的SQL包含源库所有Sequence,请根据业务需求在目标库中执行。 DTS会在源库中创建以下临时表,用于获取增量数据的DDL、增量表的结构、心跳信息等。在同步期间,请勿删除源...
PostgreSQL没有date_format函数,用to_char函数替换。替换例子:// %Y => YYYY // %m => MM // %d => DD // %H => HH24 // %i => MI // %s => SS to_char(time,'YYYY-MM-DD') => DATE_FORMAT(time,'%Y-%m-%d')to_char(time,'YYYY-MM') => DATE_FORMAT(time,'%Y-%m')to_char...